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

Question

Aubrie Berg

Chemistry

22 June, 13:30

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

+3

Answers (1)

Know the Answer?

Emilia Madden · Answer 1

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

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

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