How many mL of water must be added to 15 mL of a 0.25 M solution of H₂SO₄ to obtain a 0.05 M solution?
A) 120 mL
B) 75 mL
C) 30 mL
D) 50 mL
E) 60 mL
IMAT 2024 · Question 37
Q37 - Concentration of solutions
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The correct answer is E) 60 mL.
Dilution keeps the moles the same, so C₁V₁ = C₂V₂:
0.25 × 15 = 0.05 × V₂ → V₂ = 75 mL
That's the final volume, so the water added is 75 − 15 = 60 mL.
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