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V₁ = 100 mL
M₁ = 0,5 M
M₂= 0,2 M
Vt = ............?
Penyelesaian
* Mencari V₂
M₁ x V₁ = M₂ x V₂
0,5 x 100 = 0,2 x V₂
V₂ = (0,5 x 100) / 0,2
V₂ = 250 mL
* Mencari Vt
Vt = V₂ - V₁
Vt = 250 - 100
Vt = 150 mL
Jadi, perlu ditambahkan air 150 mL