A) 10: 1
B) 5:1
C) 1 :5
D) 1 : 10
Correct Answer: D
Solution :
Given, that \[pH=5.74,\,p{{k}_{a}}=4.74\] Suppose that volume of acid solution = x L Volume of salt solution = y L From Henderson equation, \[pH=p{{K}_{a}}+\log \frac{[Salt]}{[Acid]}\] or, \[pH-pK=\log \frac{[C{{H}_{3}}COONa]}{[C{{H}_{3}}COOH]}\] or, \[5.74-4.74=1=\log \frac{[C{{H}_{3}}COONa]}{[C{{H}_{3}}COOH]}\] or \[\frac{[C{{H}_{3}}COONa]}{[C{{H}_{3}}COOH]}=10\] or \[\frac{[C{{H}_{3}}COOH]}{[C{{H}_{3}}COONa]}=\frac{1}{10}\frac{\frac{0.1x}{x+y}}{\frac{0.1y}{x+y}}\] Thus, \[\frac{x}{y}=\frac{1}{10}\]You need to login to perform this action.
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