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[OH⁻] = 10⁻⁴
NH₄OH adalah basa lemah maka
[OH⁻] = α . M
10⁻⁴ = α . 0,1
α = 10⁻⁴ : 0,1 = 10⁻³
= 10⁻³ x 100% = 0,1%