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α = 1% = 0,01
Ka = ...?
[H⁺] = α[HA]
= 0,01 x 0,1
= 0,001 M
= 10⁻³ M
Ka[HA] = [H⁺]²
Ka. 0,1 = (10⁻³)²
Ka = 10⁻⁶/10⁻¹
= 10⁻⁵