MOLARITY AND MOLALITY

Concentration of Solutions

a measure of the amount of solute in a

given amount of solvent or solution

• Percent by Mass

• Percent by Volume

• Percent by Mass-Volume

• Mole fraction

• Molality

• Molarity

• Parts per million

Ways to express concentrations of solution

Percent by Mass (% w/w)

Percent by Volume (% v/v)

Involves the volume of both the solute and the solution.

Percent by mass-volume (%w/v)

Mole Fraction

It is the ratio of the number of moles of one component to the total number of moles in a solution

Molality (m)

The number of moles of a solute per kilogram of solvent.