Explanation Given The given value of K a is 3 .3 × 10 − 4 . The mass of acetylsalicylic acid is 5 g . The volume of the given solution is 0.250 L . The molar mass of HC 9 H 7 O 4 is, = 9(12 .01 g/mol ) + 8 ( 1 .01 g/mol ) + 4 ( 16 .0 g/mol ) = 180 .17 g/mol Molarity is calculated by the formula, M = Number of moles ( g ) Volume of solution (L) .....(1) Number of moles is calculated by the formula, n = mass ( g ) molar mass Substitute the value of the mass and molar of acetylsalicylic acid in the above expression. n = Mass ( g ) Molar mass = 5 .0 g 180 .17 g/mol = 0 .027 mol Substitute the calculated value of number of moles in equation (1) M = 0 .0277 0 .250 = 0 .1108 M The dominant equilibrium reaction that takes place in the given case is, HC 9 H 7 O 4 ( a q ) ⇌ H + ( a q ) + C 9 H 7 O 4 − ( a q ) The change in the concentration of HC 9 H 7 O 4 is assumed to be x . The ICE table is formed for the given reaction. HC 9 H 7 O 4 ( a q ) ⇌ H + ( a q ) + C 9 H 7 O 4 − ( a q ) Initial concentration : 0.022 0 0 Change : − x + x + x Equilibrium concentration: 0.022 − x x x The equilibrium concentration of [ HC 9 H 7 O 4 ] is ( 0.022 − x ) M . The equilibrium concentration of [ C 9 H 7 O 4 − ] is x M . The equilibrium concentration of [ H + ] is ( x ) M . At equilibrium, the equilibrium constant expression is expressed by the formula, K a = Concentration of products Concentration of reactants Where, K a is the acid dissociation constant

Chemistry: The Central Science, Books a la Carte Edition & Modified Mastering Chemistry with Pearson eText -- ValuePack Access Card Package

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ISBN: 9780133910919

Author: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus

Publisher: PEARSON

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Chapter 24, Problem 93AE

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To determine: The value of pH of the given solution of acetylsalicylic acid in water.

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Chapter 24, Problem 92AE

Chapter 24, Problem 94AE

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Chemistry: The Central Science, Books a la Carte Edition & Modified Mastering Chemistry with Pearson eText -- ValuePack Access Card Package

Ch. 24.2 - Prob. 24.1.1PE Ch. 24.2 - The equilibrium constant Kc for C(s) +CO2 2CO(g)...Ch. 24.2 - Prob. 24.2.1PE Ch. 24.2 - Le Chatelier noted that many industrial processes...Ch. 24.3 - Prob. 24.3.1PE Ch. 24.3 - Prob. 24.3.2PE Ch. 24.3 - [15.91] An equilibrium mixture of H2, I2, and HI...Ch. 24.3 - Consider the hypothetical reaction A(g) + 2B(g) 2...Ch. 24.3 - Prob. 24.5.1PE Ch. 24.3 - Prob. 24.5.2PE

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