sebanyak 50 ml larutan NaOH 0,1 M dicampurkan dengan 50Ml larutan CH3COOH 0,1 M. tentukan ph campuran (ka. CH3COOH =1,8 ×10-5)

n NaOH = 50 . 0,1 = 5 mmol
n CH3COOH = 50 . 0,1 = 5 mmol
NaOH + CH3COOH --->>> CH3COONa + H2O
M 5mmol. 5 mmol. -. -
R 5 mmol. 5 mmol. 5 mmol. 5mmol
R -. -. 5 mmol. 5 mmol
[CH3COONa] = 5mmol/100ml = 5.10^-2M
OH- = akar Kw/Ka [CH3COONa]
= akar 10^-14/1,8.10^-5 [5.10^-2]
akar 0,278.10^-10
= 0,53.10^-5 M
pOH = 5-log 0,53
pH = 9 + log 0,53