Question

Tentukan pH campuran 100 ml larutan CH3COOH 0,5 M dengan 50 ml larutan CH3COONa 0,2 M. (Ka = 1,8 × 10˗5)

Answer 1

N CH3COOH = 1 * 0.5 = 0.5
n CH3COONa = 0.5 * 0.2 = 0.1

[H+] = Ka * na/nbk = 1.8 x 10^-5 * 0.5/0.2 =1.8 x 10^-5 * 5
= 9 x 10^-5
pH = - log [H+]
= - log ( 9 x 10^-5)
= 5 - log 9