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M₁ x V₁ = M₂ x V₂
0,2 x 100 = M₂ x (100 + 300)
0,2 x 100 = M₂ x 400
0,2 x 1 = M₂ x 4
M₂ = 0,2/4
M₂ = 0,05 M
[OH⁻] = Molaritas x Valensi basa
[OH⁻] = 0,05 x 2
[OH⁻] = 10⁻¹
pOH = -log [OH⁻]
pOH = -log [10⁻¹]
pOH = 1
pH = 14 - pOH
pH = 14 - 1
pH = 13
Jadi, pH larutan adalah 13