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  4. For a buffer solution of CH3COOH and CH3COONa if [CH3COOH],[CH3COONa]=1 and pKa=4.74 the pH value of the solution will be

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Q. For a buffer solution of $ C{{H}_{3}}COOH $ and $ C{{H}_{3}}COONa $ if $ [C{{H}_{3}}COOH],[C{{H}_{3}}COONa]=1 $ and $ p{{K}_{a}}=4.74 $ the pH value of the solution will be

Rajasthan PETRajasthan PET 2001

Solution:

$ pH=p{{K}_{a}}+\log \frac{[salt]}{[acid]} $
$ =4.74+log\frac{1}{1} $
$ =4.74 $