A buffer is to be prepared from acetic acid (CH3COOH) and sodium acetate(NACH3COO). What ratio of NaCH3COO to CH3COOH must be used to prepare abuffer with a pH of 6.74?Useful information:Ka for CH3COOH is 1.82 x 105pH = pK, + log ([Base]/[Acid])%3!O 2:1100:1O 1:100O 1:2

Correct answer is 100 : 1. pka = -log ka = -log ( 1.82 x 10-5 ) = 5 - 0.26 = 4.74 Henderson equation…

A buffer is to be prepared from acetic acid (CH3COOH) and sodium acetate (NACH3COO). What ratio of NACH3CO0 to CH3COOH must be used to prepare a buffer with a pH of 6.74? Useful information: Ka for CH3COOH is 1.82 x 105 • pH = pK, + log ([Base]/[Acid)) O 2:1 O 100:1 O 1:100 O 1:2

A buffer is to be prepared from acetic acid (CH3COOH) and sodium acetate (NACH3COO). What ratio of NACH3CO0 to CH3COOH must be used to prepare a buffer with a pH of 6.74? Useful information: Ka for CH3COOH is 1.82 x 105 • pH = pK, + log ([Base]/[Acid)) O 2:1 O 100:1 O 1:100 O 1:2

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter16: Reactions Between Acids And Bases

Section: Chapter Questions

Problem 16.54QE

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Concept explainers

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

Question

A buffer is to be prepared from acetic acid (CH3COOH) and sodium acetate
(NACH3COO). What ratio of NaCH3COO to CH3COOH must be used to prepare a
buffer with a pH of 6.74?
Useful information:
Ka for CH3COOH is 1.82 x 105
pH = pK, + log ([Base]/[Acid])
%3!
O 2:1
100:1
O 1:100
O 1:2

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