Practice: What is the mass percent of NH3 of a 1.25 m aqueous solution of NH3?
Molality (m) represents the amount of solute dissolved per kilogram of solvent.
Understanding Molality
Example #1:
Molality is depicted as moles of solute per kilograms of solvent.
Concept #1: Ionic molality or osmolality represents the molality of dissolved ions in a solution.
Example #2:
A solution is prepared by dissolving 43.0 g potassium chlorate, KClO3, in enough water to make 100.0 mL of solution. If the density of the solution is 1.760 g/mL, what is the molality of KClO3 in the solution? MW of KClO3 is 122.55 g/mol.
Molality Calculations
Example #3:
If the molality of glucose, C6H12O6, in an aqueous solution is 2.56 what is the molarity? Density of the solution is 1.530 g/mL.
Example #4:
What is the ionic molality of nitrate ions in 0.305 m lead (IV) nitrate, Pb(NO3)4?.
