Question

Concentrated HCl is 15 M (15 molar). A 500 mL quantity of this solution is diluted by adding water to give a final volume of 2.5 L. What is the molarity of the resulting solution

Answer 1

The molarity of the resulting solution obtained by diluting the stock solution is 3 M

Data obtained from the question

• Molarity of stock solution (M₁) = 15 M
• Volume of stock solution (V₁) = 500 mL
• Volume of diluted solution (V₂) = 2.5 L = 2.5 × 1000 = 2500 mL
• Molarity of diluted solution (M₂) =?

How to determine the molarity of diluted solution

M₁V₁ = M₂V₂

15 × 500 = M₂ × 2500

7500 = M₂ × 2500

Divide both side by 2500

M₂ = 7500 / 2500

M₂ = 3 M

Thus, the volume of the resulting solution is 3 M

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