Question

Under what conditions molarity and molality of solution nearly the same

Answer 1

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Molarity and molality should be identical under the following conditions:

1. The density of the solvent is equal to 1g/mL.

2. The dissolution of the solute does not result in any change in the volume of a given amount of the solvent in which the solute is dissolved.

Since the density of water is 1g/mL, for aqueous solutions only the second condition needs to be met.

For an aqueous solution, molarity and molality should be almost equal when the concentration is very low.

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