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= (250 × 0,5 + 500 × 0,25) / 250 + 500
= 250 / 750
= 0,3 M
M pengenceran : V₁ × M₁ = V₂ × M₂
750 × 0,3 = 1000 × M₂
(3 × 0,3) ÷ 4 = M₂
0,225 M = M₂