Show by calculation why acetic acid (with Ka=1.8 x 10^-5), when combined with NaC2H3O3 as a...

Question

Question

Show by calculation why acetic acid (with Ka=1.8 x 10^-5), when combined with NaC2H3O3 as a buffer will not produce a pH of 9.00.

Answer 1

Answer #1

Acidic buffer:

pH of acidic buffer = pka + log(CH3COOH/CH3COONa)

pka of CH3COOH = 4.74

Buffer capacity range = (pka-1) to (pka+1), if the range is out this region the mixture loses its buffer nature.

so that, Acetate Buffer exhibits pH from 3.74 to 5.74.Hence Acetate Buffer does not exhibits pH = 9 .

Answer 2

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