The volume of a solution increases by 2 percent on heating while moles of solute remain same. What happens to molarity?
Answer and explanation
Correct answer: It slightly decreases
Molarity is defined by M = n/V. In this situation the number of solute moles, n, remains constant, while heating increases the solution volume V by 2%. Since the denominator becomes larger and the numerator is unchanged, the ratio decreases slightly. More precisely, the new value is M/1.02, about 98.04% of the original. Therefore option A is correct; molarity is temperature dependent.
Frequently asked questions
What is the correct answer to this question?
It slightly decreases
Why is this the correct answer?
Molarity is defined by M = n/V. In this situation the number of solute moles, n, remains constant, while heating increases the solution volume V by 2%. Since the denominator becomes larger and the numerator is unchanged, the ratio decreases slightly. More precisely, the new value is M/1.02, about 98.04% of the original. Therefore option A is correct; molarity is temperature dependent.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Some Basic Concepts of Chemistry. Topic: Mole concept and molar mass.
