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X- + H+ --> HX
Dengan yang diket:
*n CH3COONa = n CH3COO- = 0,02 mol
*n HCl = n H+ = 0,001 mol
Sehingga:
CH3COO- + H+ --> CH3COOH
m 0,02 0,001 0,02
b -0,001 -0,001 +0,001
s 0,199 - 0,201
[H+] = Ka x a/g
= 10^-5 x 0,201/0,199
= 1,0 x 10^-5
pH = 5