If equal volumes of 0.8m sodium lactate and 0.4m lactic acid are mixed, and the pka of lactic acid is 3.86,

the final of the solution ph should be

4.16

Explanation:

Considering the Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution as:

pH=pKa+log[base]/[acid]

Where Ka is the dissociation constant of the acid.

Given that:

pKa = 3.86

Given, concentration of acid = [acid] = 0.4 M

concentration of base = [base] = 0.8 M

So,

pH=3.86+log(0.8/0.4) = 4.16

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