Strong base is dissolved in 685 mL of 0.400 M weak acid (Ka = 4.21 × 10-³) to make a buffer with a pH of 3.98. Assume that the volume remains constant when the base is added. НА(аq) + ОН (аq) H,O(1) + A¯(aq) Calculate the pK, value of the acid, and determine the number of moles of acid initially present. pKa = initial amount: mol HA When the reaction is complete, what is the concentration ratio of conjugate base to acid? [A¯] = [HA] How many moles of strong base were initially added? amount added: mol OH-
Strong base is dissolved in 685 mL of 0.400 M weak acid (Ka = 4.21 × 10-³) to make a buffer with a pH of 3.98. Assume that the volume remains constant when the base is added. НА(аq) + ОН (аq) H,O(1) + A¯(aq) Calculate the pK, value of the acid, and determine the number of moles of acid initially present. pKa = initial amount: mol HA When the reaction is complete, what is the concentration ratio of conjugate base to acid? [A¯] = [HA] How many moles of strong base were initially added? amount added: mol OH-
Principles of Modern Chemistry
8th Edition
ISBN:9781305079113
Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler
Chapter15: Acid–base Equilibria
Section: Chapter Questions
Problem 57P
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