a student is preparing a Lactic acid (HLac) buffer (Ka= 1.4 X 10-4 , PH=4.00) answer the following questions: A. how many moles of conjugate base should be added to 315 mL of 0.45 M HLac to give a PH of 4.00? B. what is the ratio of the concentration of HLac to its conjugate base?

General, Organic, and Biological Chemistry
7th Edition
ISBN:9781285853918
Author:H. Stephen Stoker
Publisher:H. Stephen Stoker
Chapter10: Acids, Bases, And Salts
Section: Chapter Questions
Problem 10.125EP: What is the pH of a buffer that is 0.150 M in a weak acid and 0.150 M in the acids conjugate base?...
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a student is preparing a Lactic acid (HLac) buffer (Ka= 1.4 X 10-4 PH=4.00)

answer the following questions:

A. how many moles of conjugate base should be added to 315 mL of 0.45 M HLac to give a PH of 4.00?

B. what is the ratio of the concentration of HLac to its conjugate base?

 

 

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