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Acidic Buffer Action

In order to p...

Question

In order to prepare a buffer solution of pH 5.74, sodium acetate is added to acetic acid. If the concentration of acetic acid in the buffer is 1.0 M, the concentration of sodium acetate in the buffer is _________ M. (Round off to the Nearest Integer).
[Given: pK_a (acetic acid) = 4.74]

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Solution

pH is a parameter used to find out the acidity or basicity of the given compound as well as the concentration of it.
$p H = p K_{a} + \log (\frac{c o n c e n t r a t i o n o f b a s e}{c o n c e n t r a t i o n o f a c i d})$
$5.74 = 4.74 + \log (\frac{c o n c e n t r a t i o n o f b a s e}{1})$
by solving above equation, we get
$10 = c o n c e n t r a t i o n o f b a s e$
So, the correct answer is 10 M.

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