define molality of solution
Answers
Molality, also called molal concentration, is a measure of the concentration of a solute in a solution in terms of amount of substance in a specified amount of mass of the solvent. This contrasts with the definition of molarity which is based on a specified volume of solution.
A commonly used unit for molality in chemistry is mol/kg. A solution of concentration 1 mol/kg is also sometimes denoted as 1 molal.
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Molality is considered better for expressing the concentration as compared to molarity ,because the molarity changes with temperature because of expansion or contraction of the liquid with temperature .How ever , molality does not change with temperature because mass of the solvent does not change in temperature