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H⁺ = 10⁻¹
M2 = 5 x 10⁻²
M1 . V1 = M2 . V2
0,5 . 50 mL = 5 x 10⁻² . V2
V2 = 500 mL
V air yang ditambahkan = V2 - V1 = 500 mL - 50 mL = 450 mL (B)