A solution has a molarity of 0.4 mol L⁻¹ and a volume of 250 mL. What volume of a 0.1 mol L⁻¹ solution of the same solute will contain the same number of moles?
Answer and explanation
Correct answer: 1000 mL
Use the relation moles = molarity × volume in litres. The first solution contains 0.4 × 0.250 = 0.100 mol of solute. If the required solution has concentration 0.1 mol L⁻¹, its volume must be 0.100/0.1 = 1.00 L. Converting litres to millilitres gives 1000 mL, so D is correct. The smaller volumes would contain fewer than 0.100 mol at this lower concentration.
Frequently asked questions
What is the correct answer to this question?
1000 mL
Why is this the correct answer?
Use the relation moles = molarity × volume in litres. The first solution contains 0.4 × 0.250 = 0.100 mol of solute. If the required solution has concentration 0.1 mol L⁻¹, its volume must be 0.100/0.1 = 1.00 L. Converting litres to millilitres gives 1000 mL, so D is correct. The smaller volumes would contain fewer than 0.100 mol at this lower concentration.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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