Question

Out of 1 molal and 1 molar aqueous solutions which is more concentrated? Justify.

Answer 1

Dear Student,

For most of the aqueous solutions, 1 M solutions have higher concentrations than corresponding 1 m solutions.
It is so because in 1 m solutions, 1 mol of solute is present in 1000 g. ie., 1000 cm³ (d = 1) of water. But in 1 M solution 1 mol of solute is present in 1000 cm³ of solution which contain less than 1000 cm³ of solvent. However in case of non-aqueous solutions, 1 M solution can be less, more or even has same concentration as that of 1 m solution depending on density of solution.

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