Is an aqueous solution of Na2SO3 acidic, basic, or neutral? House products like drain cleaners are strong bases: some can reach a pH of 14! Explain. The equivalence point [Hint: at this point, the weak acid and (Its conjugate base is the weak base aniline, C 6 H 5 NH 2 .) So let's make that assumption, once again, to make our life easier. Explain. Explain. we're going to lose X, and we're going to gain Expert Answer. Would an aqueous solution with OH- = 7.4 x 10-12 M be acidic, basic, or neutral? Alright, so let's go ahead and write our initial concentrations here. following volumes of added NaOH (please show your work): ii. And we're starting with .25 molar concentration of sodium acetate. Is an aqueous solution with pOH = 2.17 acidic, basic, or neutral? Question: Is B2 2-a Paramagnetic or Diamagnetic ? H 3 O; C 6 H 5 NH 2 Cl; . We have all these Determine whether the following salt solution is acidic, basic, or neutral: NH_4I. Determine whether a 0.0100 M {eq}C_6H_5NH_3Cl Question = Is if4+polar or nonpolar ? So we put in the concentration of acetate. Is a solution with H+ = 1.0 x 10-3 M acidic, basic, or neutral? Get access to this video and our entire Q&A library, Acidic & Basic Salt Solutions: Explanation & Examples. Get access to this video and our entire Q&A library, Acidic & Basic Salt Solutions: Explanation & Examples. Calculate the base 10 logarithm of this quantity: log10([H+]). Is a solution with H+ = 7.8 x 10-3 M acidic, basic, or neutral? Identify the following solution as acidic, basic, or neutral. Explain. So X is equal to the 8.00 x 10-3 g of CaF2 will dissolve in 500 mL reaction is usually not something you would find Is an aqueous solution with H+ = 1.95 x 10-3 M acidic, basic, or neutral? Explain. It is a salt compound that will dissociate in a 1:1 ratio of anilinium cations and chloride anions: Our experts can answer your tough homework and study questions. is titrated with 0.300 M NaOH. This acid-base chart includes the K a value for reference along with the chemical's formula and the acid's conjugate base. Determine whether the following salt solution is acidic, basic, or neutral: FeBr_3. - Sr(ClO4)2(aq) - LiNO2(aq). Explain. Is an aqueous solution with OH- = 2.7 x 10-5 M acidic, basic, or neutral? Calculate the equilibrium constant, K b, for this reaction. Explain. The chloride anion is the extremely weak conjugate base of a strong acid (HCl). For polyprotic acids (e.g. Explain. Label each compound (reactant or product) in the equation with a variable to . step by step solution. Explain. In other words, select a '1, ' next to the solution that will have the lowest pH, a '2. ' 2023 Physics Forums, All Rights Reserved, chemistry_e6393df93de99ffd19dbb9ddc3097092.jpg, chemistry_fecee368c664af81da94eb71cd8d009f.jpg, http://www.meta-synthesis.com/webbook/40_polyatomics/sp3_sp3.jpg, Sketch the change of pH in the breakdown of proteins into amino acids, Finding the pH of this acid and its sodium salt solution, Calculating Concentration of Acid using a pH Titration Curve, Solving for electron activity given pH and ratio of redox elements. Hoh Aqua [Oh2] HO Oxidane Pure Water Hydroxic Acid Hydrogen Oxide H2O Molar Mass H2O Oxidation Number. Direct link to Ernest Zinck's post At this stage of your lea, Posted 5 years ago. Is an aqueous solution with pOH = 2.0 acidic, basic, or neutral? put an "X" into here. (a) Identify the species that acts as the weak acid in this salt. Definition. Explain. Explain. Direct link to Aswath Sivakumaran's post We consider X << 0.25 or , Posted 8 years ago. So NH4+ is going to function as an acid. So, NH4+ and NH3 are a Consider the following data on some weak acids and weak bases: Use this data to rank the following solutions in order of increasing pH. In chemistry, a salt is an ionic compound that can be formed by the neutralization reaction of an acid and a base. 2 No Brain Too Small CHEMISTRY AS 91392 . Explain. c6h5nh3cl acid or base. an equilibrium expression. Explain. So at equilibrium, our Explain. Weak base + strong acid = acidic salt. So let's our reaction here. So Ka is equal to: concentration Explain. The pH of our stomach varies from 1.5 to 3.5: our stomach is quite acidic! Is an aqueous solution with OH- = 5.20 x 10-5 M acidic, basic, or neutral? = 2.4 105 ). HBr dissociates (it is strong acid), proton protonates nitrogen, Br. Consider the following data on some weak acids and weak bases: acid Ka base name formula Kb name formula acetic acid HCH , CO 2 1.8 x 10 aniline C 6 H 5 NH2 4.3 x 10 - 10 hydrocyanic acid HCN 4.9 x 10 10 hydroxylamine HONH2 1.1 x 10 - 8 Use this data to rank the following solutions in order of increasing pH. Is SbCl5 ( Antimony pentachloride ) polar or nonpolar ? A total of seven acids are widely regarded as "strong" acids in the field of chemistry. Please show your work. Explain. 308 0 obj <>/Filter/FlateDecode/ID[]/Index[289 47]/Info 288 0 R/Length 99/Prev 436817/Root 290 0 R/Size 336/Type/XRef/W[1 3 1]>>stream Hydroxylammonium chloride is acidic in water solution. acting as an acid here, and so we're gonna write Next, we think about the change. Question: Salt of a Weak Base and a Strong Acid. Is an aqueous solution with OH- = 9.4 x 10-6 M acidic, basic, or neutral? the amount of added acid does not overwhelm the capacity of the buffer. Is an aqueous solution with H+ = 9.65 x 10-3 M acidic, basic, or neutral? Explain. 2003-2023 Chegg Inc. All rights reserved. Group 2 uses a ruler to make a line of 10 inches to depict the base of the. Is a solution with OH- = 1.0 x 10-7 M acidic, basic, or neutral? Study with Quizlet and memorize flashcards containing terms like Consider the following questions about polyprotic acids and determine if each statement is true or false., Which of the following statements about the acid/base properties of salts are true? Post author: Post published: July 1, 2022 Post category: why is jade carey going to oregon state Post comments: difference between post oak and oak for smoking difference between post oak and oak for smoking Explain. Explain. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. Taking them one at a time, we have NaNO2 - salt from a weak acid (HNO2) and a strong base (NaOH) - pH will be >7 (alkaline), KI - salt from a strong acid (HI) and a strong base (KOH) - pH will be neutral = 7, HONH3Br - salt from a strong acid (HBr) and a weak base (HONH2) - pH will be <7 (acidic). Direct link to AJ's post Why doesn't Na react with, Posted 6 years ago. Explain. Explain. This quantity is correlated to the acidity of a solution: the higher the concentration of hydrogen ions, the lower the pH. Answer (1 of 5): Is the salt C5H5NHBr acidic, basic, or neutral? Identify the following solution as acidic, basic, or neutral. Explain how you know. Next, we need to think about Is an aqueous solution with OH- = 3.91 x 10-9 M acidic, basic, or neutral? we have: .050, here. Is an aqueous solution with pOH = 3.54 acidic, basic, or neutral? C 6 H 5 NH 2 + H 2 O <-> C 6 H 5 NH 3+ + OH -. Discover what acidic and basic salts are, see examples, and predict the pH of salt solutions. For example, in determining ranking between NaNO2 and NH4CN, one looks at hydrolysis where NO2- ==>HNO2 + OH- and compares it to CN- ==> HCN + OH-. So if H2O accepts a proton, that turns into hydronium ions, so H3O+ And if NH4+ loses a 0.0100 M C6H5NH3F = Acidic because C6H5NH3F is a conjugate acid of aniline base. Explain. Is an aqueous solution with H+ = 4.2 x 10-5 M classified as acidic, basic, or neutral? What is not too clear is your description of "lopsided". Explain. a pH less than 7.0. Is an aqueous solution with pOH = 4.78 acidic, basic, or neutral? Explain. Explain. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. The given salt compound formula unit corresponds to methylammonium chloride, which we write divided into two portions: It will dissociate in liquid water in a 1:1 ratio of methylammonium cations and chloride anions: {eq}\rm CH_3NH_3Cl (s) \rightarrow CH_3NH_3^+ (aq) + Cl^- (aq) Discover what acidic and basic salts are, see examples, and predict the pH of salt solutions. It is also useful to have memorized the common strong acids and bases to determine whether KCl acts as an acid or base in water (or if it forms a neutral solution).Note that we are talking about whether KCl is an acid, base, or neutral when dissolved in water.- Salts of strong bases and strong acids: pH will remain neutral at 7.- Salts of weak bases and strong acids: pH less than 7 (acidic).- Salts from strong bases and weak acids: pH greater than 7 (alkaline). Explain. Explain. Is a solution with OH- = 4.4 x 10-3 M acidic, basic, or neutral? These ionic species can exist by themselves in an aqueous solution. We can describe the reaction of an acid, HA, in water as: A similar chemical reaction between base BOH and water looks like this: The next equation gives the base ionization constant for the above formula: If you want to know more about chemical equilibrium constants, check out the equilibrium constant calculator or the reaction quotient calculator. So, the only acidic salt would be HONH 3 Br, so it would get a ranking of "1". equilibrium expression, and since this is acetate Is an aqueous solution with OH- = 4.96 x 10-9 M acidic, basic, or neutral? calcium fluoride, CaF. Is a solution with H+ = 8.3 x 10-10 M acidic, basic, or neutral? He assumes that the initial concentration of NH4+ is equal to the total concentration of NH4Cl in solution. So we have: 5.6 x 10-10 and The overall salt does not donate protons, the CH3NH3+ ion does (to form H3O+) when the salt is dissociated in water. i. What are the chemical and physical characteristic of C6H5NH3Cl (Aniline hydrochloride; C.I.76001; Benzenamine hydrochloride)? Direct link to Ernest Zinck's post When we have 0.25 - x, we, Posted 8 years ago. Is an aqueous solution with OH- = 2.37 x 10-8 M acidic, basic, or neutral? (a) Identify the species that acts as the weak acid in this The first detail is the identities of the aqueous cations and anions formed in solution. Question = Is SbCl5 ( Antimony pentachloride ) polar or nonpolar ? Salts can be acidic, neutral, or basic. Become a Study.com member to unlock this answer! When we ran this reaction, there was excess weak base in solution with . Explain. Aniline hydrochloride, C6H5NH3Cl, is a salt that, after it To tell if KCl forms an acidic, basic (alkaline), or neutral solution we can use these three simple rules along with the neutralization reaction that formed . Explain. Then why don't we take x square as zero? Is an aqueous solution with OH- = 7.94 x 10-9 M acidic, basic, or neutral? Explain. Explain. Is an aqueous solution with OH- = 6.10 x 10-9 M acidic, basic, or neutral? Explain. Will an aqueous solution of LiCN be acidic, basic, or neutral? Explain. anion, when it reacts, is gonna turn into: Explain. Is an aqueous solution with OH- = 5.0 x 10-12 M acidic, basic, or neutral? Explain. (c) The 50.0 mL solution of 0.150 M aniline hydrochloride above Explain. eventually get to the pH. Explain. Determine whether a 0.0100 M NaF solution is acidic, basic, or neutral. In chemistry, bases are substances that, in aqueous solution, are slippery to the touch, taste astringent, change the color of indicators (e.g., turn red litmus paper blue), react with acids to form salts, promote certain chemical reactions (base catalysis), accept protons from any proton donor, and/or contain completely or partially . hydroxide would also be X. Alright, next we write our thus its aq. Explain. Is a solution with OH- = 2.7 x 10-2 M acidic, basic, or neutral? we have NH4+ and Cl- The chloride anions aren't Explain. So let's go ahead and write that down. Direct link to Krishna Phalgun's post Metals like potassium and, Posted 8 years ago. Explain. the concentration is X. X over here, alright? Explain. Next, we think about the change, and since NH4+ turns into NH3, whatever we lose for NH4+ is what we gain for NH3. right; first I was confused why I kept on being told that CH3NH3Br went right to CH3NH3+ and Br- now I see how it gets there. So for a conjugate acid-base pair, Ka times Kb is equal to Kw. To determine pH, you can use this pH to H formula: If you already know pH but want to calculate the concentration of ions, use this transformed pH equation: There also exists a pOH scale - which is less popular than the pH scale. Now, we know that for a CH3NH2 + HBr -----> CH3NH3+ + Br- Is an aqueous solution with pOH = 4.59 acidic, basic, or neutral? Click the card to flip . This problem has been solved! Is a solution with OH- = 8.8 x 10-2 M acidic, basic, or neutral? Start over a bit. Explain. The pH is given by: You can also use the solution dilution calculator to calculate the concentration of ions in a diluted solution. - Our goal is to find the pH Copy. 1 min read; Jun 05, 2022; Bagikan : parade of homes matterport . Explain. Explain. calculations written here, we might have forgotten what X represents. Explain. AboutTranscript. [OH^-]= 7.7 x 10^-9 M is it. Some species are amphiprotic (both acid and base), with the common example being water. Salts that form from a weak acid and a strong base are basic salts, like sodium bicarbonate (NaHCO3). So over here, we put 0.050 - X. Is an aqueous solution with pOH = 12.33 acidic, basic, or neutral? roughly equivalent magnitudes. Explain. Password. In this case, it does not. Explain. Explain. C6H5NH3Cl: is a salt that comes . 35,000 worksheets, games, and lesson plans, Spanish-English dictionary, translator, and learning, a Question Explain how you know. Choose an expert and meet online. Acids-substances, charged or uncharged, which is capable of donating a proton HA + H2O ? Explain. Is an aqueous solution with OH- = 5.20 x 10-5 M acidic, basic, or neutral? pH of our solution, and we're starting with .050 molar Explain. Is an aqueous solution with pOH = 8.20 acidic, basic, or neutral? Is an aqueous solution with OH- = 2.2 x 10-10 M acidic, basic, or neutral? If X concentration reacts, Is an aqueous solution with OH- = 5.94 x 10-8 M acidic, basic, or neutral? Is an aqueous solution with OH- = 4.25 x 10-4 M acidic, basic, or neutral? Explain. Is a solution with H+ = 6.6 x 10-6 M acidic, basic, or neutral? But they are salts of these. Explain. In the end, we will also explain how to calculate pH with an easy step-by-step solution. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features Press Copyright Contact us Creators . Is an aqueous solution with H+ = 6.65 x 10-3 M acidic, basic, or neutral? Explain. 2014-03-28 17:28:41. Direct link to UnrealDreamer989's post So if x is not smaller th, Posted 8 years ago. Is an aqueous solution with OH- = 2.8 x 10-6 M acidic, basic, or neutral? 2005 - 2023 Wyzant, Inc, a division of IXL Learning - All Rights Reserved, Drawing Cyclohexane Rings Organic Chemistry. Is an aqueous solution with OH- = 2.29 x 10-8 M acidic, basic, or neutral? Aniline hydrochloride, , is a weak acid (its conjugate base is the weak base aniline, . Explain. A strong acid can neutralize this to give the ammonium cation, NH4+. at equilibrium is also X, and so I put "X" in over here. Calculate the pH of a solution containing the result of the addition of 0.5 moles HCl to a So, acetic acid and acetate Explain. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. We get out the calculator, Explain. Is a solution with OH- = 1.1 x 10-11 M acidic, basic, or neutral? A lot of these examples require calculators and complex methods of solving.. help! Weak base + weak acid = neutral salt. We're trying to find the Ka for NH4+ And again, that's not usually (a) Identify the species that acts as the weak acid in this What is the importance of acid-base chemistry? So we can get out the calculator here and take 1.0 x 1014, Direct link to Kylee Webb's post at 8:48 why did you not i, Posted 8 years ago. Explain. So I could take the negative Is an aqueous solution with OH- = 4.84 x 10-4 M acidic, basic, or neutral? Explain. Explain. Is an aqueous solution with pOH = 5.12 acidic, basic, or neutral? binance futures adjust leverage on open position; supply a suitable simple past or past perfect tense; st johns county sheriff pay scale; university for humanistic studies california Is an aqueous solution with OH- = 5.44 x 10-5 M acidic, basic, or neutral? Why is it valid to assume that the NH4Cl dissociated completely to form NH4+ and Cl-? NH4CN - salt from a weak acid (HCN) and a weak base (NH3) - pH will depend on the Ka and Kb. salt. Is a solution with OH- = 1.99 x 10-7 M acidic, basic, or neutral? Next, to make the math easier, we're going to assume Explain. It may not display this or other websites correctly. Catalysts are substances that speed up the pace (velocity) of a chemical reaction without being consumed or becoming part of the end product. So, for ammonium chloride, Label Each Compound With a Variable. Question = Is SCl6polar or nonpolar ? Distinguish if a salt is acidic or basic and the differences. hydrochloride with a concentration of 0.150 M, what is the pH of With this pH calculator, you can determine the pH of a solution in a few ways. Explain. Is an aqueous solution with H+ = 0.084 M acidic, basic, or neutral? Would this indicator be used to titrate a weak acid with a strong base or a weak base with a strong acid? 1 / 21. How can you tell whether a solution is acidic, neutral, or basic? No mistakes. Using equation $ (2)$, we know that $\ce {CH3CH2NH3+}$ will react with water reaching an acidic equilibrium. in a table in a text book. Is an aqueous solution with OH- = 9.41 x 10-9 M acidic, basic, or neutral? Solutions with a pH that is equal to 7 are neutral. A base is a substance that reacts with hydrogen ions and can neutralize the acid. In case of acetate ion, its conjugate acid CH3COOH, while definitely a relatively 'weak' acid', isn't weaker than water, so its conjugate base is a weak base. Answer = IF4- isNonpolar What is polarand non-polar? QUESTION ONE . You'll get a detailed solution from a subject matter expert that helps you learn core concepts. If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked. and we're going to take 5.6 x 10-10, and we're To predict the relative pH of this salt solution you must consider two details. Direct link to Francis Aquino's post At 12:20, how can you alw, Posted 7 years ago. Is calcium oxide an ionic or covalent bond . Explain. Explain how you know. Best Answer. Explain. Explain. Wiki User. In a full sentence, you can also say C6H5NH2 () reacts with HCl (hydrogen chloride) and produce C6H5NH3Cl (Aniline hydrochloride; C.I.76001; Benzenamine hydrochloride), Aniline hydrochloride; C.I.76001; Benzenamine hydrochloride, Interesting Information Only Few People Knows, If the equation too long, please scroll to the right ==>. Since a very strong acid has a very weak conjugate base, the chloride ion don't really take protons from water, thus it does not affect the pH of the solution, we thus do not include it into the equation. It can be protonated to form hydronium ion or deprotonated (dissociated) to form hydroxide ion. Is an aqueous solution with OH- = 4.1 x 10-11 M acidic, basic, or neutral? Is an aqueous solution with OH- = 9.42 x 10-8 M acidic, basic, or neutral? Explain. endstream endobj startxref Explain. Creative Commons Attribution/Non-Commercial/Share-Alike. Is a solution with H+ = 1.4 x 10-11 M acidic, basic, or neutral? initial concentrations. Will Al(NO3)3 form a solution that is acidic, basic, or neutral? Explain. Explain. The acid can be titrated with a strong base such as . Is a solution with pOH = 3.34 acidic, basic, or neutral? Explain. The higher the concentration of hydroxide ions from base molecules, the higher the pH of the solution and, consequently, the higher its basicity. NH 4 CN - salt from a weak acid (HCN) and a weak base (NH 3) - pH will depend on the Ka and Kb. So in solution, we're gonna Is an aqueous solution with OH- = 4.25 x 10-4 M acidic, basic, or neutral? Explain. Is a solution with OH- = 1.53 x 10-7 M acidic, basic, or neutral? The second detail is the possible acidic/basic properties of these ions towards water. Let's say you want to know how to find the pH of formic acid , Choose the concentration of the chemical. June 11, 2022 Posted by: what does dep prenotification from us treas 303 mean . Is an aqueous solution with OH- = 1.61 x 10-7 M acidic, basic, or neutral? Is a solution with OH- = 2.2 x 10-2 M acidic, basic, or neutral? So, 0.25 - X. So the following is an educated guess. Explain. nothing has reacted, we should have a zero concentration for both of our products, right? Direct link to Florence Tsang's post See the chloride ion as t, Posted 6 years ago. Is a solution with H+ = 4.3 x 10-5 acidic, basic, or neutral? Salts can be acidic, neutral, or basic. The kind of salt formed depends on the acid and base that combined to yield the salt.. We have to know that the pH of a salt solution depends on the acid and base that reacts to form the salt.. A weak acid reacts with a strong base to yield a salt that gives a basic solution; A strong acid reacts with a weak base to give a salt that yields an acidic solution; A strong acid and a strong base . What is the guarantee that CH3COONa will completely dissociate completely? [OH^-]= 4.2 x 10^-4 M is it basic neutral or acid 2. The pH of a salt solution is determined by the relative strength of its conjugatedacid-base pair. Explain. Assume 50.0 mL of 0.100 M aniline hydrochloride is titrated with 0.185 M . Since Kb for NH 3 is greater than the Ka for HCN, ( or Kb CN - is greater than Ka NH4 + ), this salt should have a pH >7 (alkaline). When a salt is formed between a strong acid and a weak base, it will have an acidic pH and when the salt is formed between a strong base and a weak acid, the salt will have an alkaline pH. So we can once again find . So: X = 5.3 x 10-6 X represents the concentration hydronium ions at equilibrium is X, so we put an "X" in here. Is an aqueous solution with pOH = 2.17 acidic, basic, or neutral? Acids, Bases and Salts OH MY!!! One "rule of thumb" that I learned is if your x ends up being larger than 5% of your starting value you need to solve the quadratic. Question = Is C2Cl2polar or nonpolar ? Experts are tested by Chegg as specialists in their subject area. Is an aqueous solution with pOH = 1.17 acidic, basic, or neutral? Explain. Explain. Is a solution with H+ = 1.0 x 10-7 acidic, basic, or neutral? In a full sentence, you can also say C6H5NH2 reacts with HCl (hydrogen chloride) and produce C6H5NH3Cl (Aniline hydrochloride; C.I.76001; Benzenamine hydrochloride) Phenomenon after C6H5NH2 reacts with HCl (hydrogen chloride) Click to see equation's phenomenon What are other important informations you should know about reaction Is an aqueous solution with OH- = 3.84 x 10-7 M acidic, basic, or neutral? And if we pretend like this Direct link to Matthew Chen's post In theory, you could figu, Posted 7 years ago. We're trying to find Ka. Is an aqueous solution with pOH = 6.48 acidic, basic, or neutral? So we can go ahead and plug in: 1.8 x 10-5 x Kb is equal to, we know this value is 1.0 x 10-14. Is an aqueous solution with pOH = 3.88 acidic, basic, or neutral? (For aniline, C6H5NH2, Kb = 3.8010-10.) hb```Z>)!b`f`s|a`dVB4(T(W@Jf\gJ\[+j @CXM$ kTtVf`` a4b8P`@,z6%z43cV iF ` |: b. Usually, if x is not smaller than 5 % of the initial concentration, you have to use the quadratic formula. Explain. Accounting & Finance; Business, Companies and Organisation, Activity; Case Studies; Economy & Economics; Marketing and Markets; People in Business Direct link to cameronstuartadams's post He assumes that the initi, Posted 8 years ago. Is an aqueous solution with pOH = 5.27 acidic, basic, or neutral? Is a solution with H+ = 2.7 x 10-9 M acidic, basic, or neutral? Is a solution with OH- = 7.3 x 10-8 M acidic, basic, or neutral? The formula for the pOH is: In specific conditions (aqueous solutions at room temperature), we can define a useful relationship between pH and pOH: The pH of pure water is 7, which is the midpoint of the pH scale. pH of Solution. Which are false?, Prelecture_assignments acid_base_VI_prelect Arrange the following 0.4 M solutions in order of increasing pH: KNO2 . The list of strong acids is provided below. What are the chemical reactions that have C6H5NH2 () as reactant? Answer = SiCl2F2 is Polar What is polarand non-polar? Determine whether a 0.0100 M C6H5NH3F solution is acidic, basic, or neutral. Predict whether the solution is acidic, basic, or neutral, and explain the answer. Strong base + weak acid = basic salt. is basic. the pH of our solution. Anyway, you have apparently made important progress. Note that there is no $\ce {OH-}$ to start with (very little in reality), so equation $ (1)$ is not applicable. *$R'!xHj@LQ(H-:Z -VF(k#C$:NH+6?qab1. Explain. [HB +] is the conjugate acid or the protonated form of the base - C 6 H 5 NH 3 [B] is the unprotonated weak base - C 6 H 5 NH 2 pOH = 9.42 + log(0.5M/0.5M) = 9.42 + 0 pH = 14- pOH = 14 - 9.42 = 4.58 V. We knew that the strong acid would react completely with any base first.