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M1V1 + M2V2 =M3V3
0,1.100 + 0,2.150 = M3.250
M3 = 0,16M
mol CH3COOH = 40 mmol
mol NaOH = 20 mmol
CH3COOH + NaOH --> CH3COONa + H2O
40 20
20 20 20
20 - 20
mol CH3COOH = mol CH3COONa (bisa diabaikan)
[H+] = Ka
= 10^-5
pH = 5 (B)