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Karena istotonik, maka tekanan osmotik 0,35 M sukrosa = tekanan osmotik 0,25 NH₄OH
π Sukrosa = π NH₄OH
M₁ • R₁ • T₁ = M₂ • R₂ • T₂ • i
M₁ = M₂ • i
M₁ = M₂ • [1 + (n-1)α]
0,35 = 0,25 • [1 + (2-1)α]
0,35/0,25 = 1 + α
1,4 = 1 + α
α = 1,4 - 1
α = 0,4
Jadi, derajat ionisasi NH₄OH sebesar 0,4 (Jawaban B)