
Concept explainers
Interpretation:
The differences between molarity and molality are to be written.
Concept introduction:
Molality is the amount of solute per kilogram of solvent and Molarity is the amount of solute per litre of solution.

Answer to Problem 84A
The molarity of a solution depends on the type of both solute and solvent while the molality depends only on the nature of solvent. The molarity of a fixed solution can change with change in physical conditions, but molality remains same in every condition.
Explanation of Solution
Since the molarity of a solution depends upon the volume of whole solution and not solvent only, the nature of solute is also considered. Also, the dependence of molarity on volume makes it change with changes in pressure or temperature due to volume being dependent on it.
Molarity and molality differ from each other due to their different dependencies and units of measurement.
Chapter 20 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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