A. What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M?   B. What is the hydroxide ion concentration, [OH−][OH−], in an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M? C. A monoprotic weak acid, HAHA, dissociates in water according to the reaction HA(aq)↽−−⇀H+(aq)+A−(aq)HA(aq)↽−−⇀H+(aq)+A−(aq) The equilibrium concentrations of the reactants and products are [HA]=0.120 M[HA]=0.120 M, [H+]=3.00×10−4 M[H+]=3.00×10−4 M, and [A−]=3.00 ×10−4 M[A−]=3.00 ×10−4 M. Calculate the ?aKa value for the acid HA.

Chemistry & Chemical Reactivity
10th Edition
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Chapter4: Stoichiometry: Quantitative Information About Chemical Reactions
Section: Chapter Questions
Problem 109GQ: (a) What is the pH of a 0.105 M HCl solution? (b) What is the hydronium ion concentration in a...
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A. What is the pH of an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M?
 
B. What is the hydroxide ion concentration, [OH−][OH−], in an aqueous solution with a hydrogen ion concentration of [H+]=7.2×10−5[H+]=7.2×10−5 M?

C. A monoprotic weak acid, HAHA, dissociates in water according to the reaction

HA(aq)↽−−⇀H+(aq)+A−(aq)HA(aq)↽−−⇀H+(aq)+A−(aq)

The equilibrium concentrations of the reactants and products are [HA]=0.120 M[HA]=0.120 M, [H+]=3.00×10−4 M[H+]=3.00×10−4 M, and [A−]=3.00 ×10−4 M[A−]=3.00 ×10−4 M. Calculate the ?aKa value for the acid HA. 

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