If a solution is heated and its volume increases while moles of solute remain the same, what happens to molarity and molality?
Answer and explanation
Correct answer: Molarity decreases and molality remains nearly the same
Molarity is defined as moles of solute per litre of solution, so increasing volume while retaining the same solute moles lowers the molarity. Molality is moles of solute per kilogram of solvent. Since solvent mass is essentially unchanged by heating in this ideal treatment, molality remains nearly constant. Thus option A is correct, not B, C, or D.
Frequently asked questions
What is the correct answer to this question?
Molarity decreases and molality remains nearly the same
Why is this the correct answer?
Molarity is defined as moles of solute per litre of solution, so increasing volume while retaining the same solute moles lowers the molarity. Molality is moles of solute per kilogram of solvent. Since solvent mass is essentially unchanged by heating in this ideal treatment, molality remains nearly constant. Thus option A is correct, not B, C, or D.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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