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m 1 0,5
b 1 0,5 0,5
s - - 0,5
M (NH4)2SO4 = 0,5 ÷ 20 = 0,025 M
H^+ = √ (Kw ÷ Kb) × M
= √ (10^-14 ÷ 10^-5) × 25 × 10^-3
= 5 × 10^-6
pH = 6 - log 5