# Concentration Units

 Concentration Units

All concentration units are a ratio of the amount of ____________ divided by either the amount of solvent or the amount of ____________.

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Because molarity is based on the ____________ of the solution and because ____________ changes can result in volume changes, the molarity of a solution can change with temperature even when no other changes are made to the solution. When an experiment involves temperature changes, the unit ____________ is often used instead of molarity.

With mole fraction, no distinction is made between the ____________ and the ____________ in the calculations; the mole fraction of every component of the solution is calculated the same way. The sum of mole fractions for all solution components (the solvent and all solutes) is equal to ____________.

When converting between concentration units, you can choose an arbitrary total amount of solution to begin the calculation. Remember that concentration is an ____________ property

Strategy to convert between concentration units:

1. Write out the concentration as a ratio showing all the ____________ in their entirety!
2. Convert the solute into the required unit.
3. Convert the denominator into the required unit.
4. Use the concentration ratio to calculate the new concentration unit.
5. ____________ is the link from going from mass to volume or volume to mass.
6. Remember that a ____________ is composed of a solvent & solute.

 Practice Problems

1. Calculate the molarity and molality of 268.3 mL of a solution containing 0.5142 mol of CsCl and 197.5 g of water.

1. Calculate the mole fraction of each component in a solution that is 15.7% by mass methyl alcohol, CH3OH, in water.