Question

a buffer is to be prepared by adding solid sodium acetate to 0.10M CH3COOH. Which othe following concentrations of sodium acetate will produce the most effective buffer?

A. 3.0M CH3COONa
B 2.5M CH3COONa
C 2.0M CH3COONa
D 1.5M CH3COONa
E .30M CH3COONa

HELP

Answer 1

Please don't change screen names.
Buffers are most effective when the pKa is in the range of desired pH; and that means base/acid = 1
So you want to pick the NaC2H3O2 concn that gives the value closest to b/a = 1.

Answer 2

E 0.30