Question

Campuran 100ml larutan CH3COOH 1 M dan 100ml CH3COONa 1 M. Tentukan pH larutan setelah penambahan 10ml HCl 1 M (Ka CH3COOH= 1,8x10^-5 dan log 2,2= 0 34

Answer 1

CH3COONa + HCl -> CH3COOH + NaCl
m 100 mmol 10 mmol 100 mmol -
b 10 mmol 10 mmol 10 mmol 10 mmol
s 90 mmol - 110 mmol 10 mmol

[H+] = ka x a/ g
= 1,8 x 10^-5 x 110/90
= 19,8 . 10^-5 / 90
= 2,2 x 10^-5
pH = 5-log 2,2
= 5 - 0,34
= 4,66