pH larutan 100 ml CH3COONa 0,1 M adalah... (Ka CH3COOH=10-5,Kw=10-14)

Mol CH3COONa = 100 ml x 0,1 mmol/ml = 10 mmol
Mol ion [Na+] = 1 x 10 = 10 mmol

[OH-] = kb x b/g
= 1 x 10-5 (10/10)
= 1 x 10-5 = 1 x 10-6
POH = -log 1 x 10-6
= 6 - log 1
Maka pH = 14 - (6 - log 1)
= 8