1. Calculations of
Solution Concentration

2. CA Standards
Students know the definitions of solute and solvent.
Students know how to calculate the concentration of a
solute in terms of grams per liter, molarity, parts per
million, and percent composition.

3. Calculations of Solution Concentration:
Grams per Liter
Grams per liter is the ratio of mass units
of solute to volume (liters) of solution
mass of solute
Grams per liter
volume of solution

4. Calculations of Solution Concentration:
Molarity
Molarity is the ratio of moles of
solute to liters of solution
moles of solute
Molarity M
Liter of solution

5. Calculations of Solution Concentration:
Mass Percent
Mass percent is the ratio of mass units of
solute to mass units of solution, expressed
as a percent
mass of solute
Mass percent x100
mass of solution

6. Calculations of Solution Concentration:
Parts per Million
Parts per million is the ratio of mass units
of solute to mass units of solution,
multiplied by one million (106)
mass of solute 6
Mass percent x10
mass of solution

7. A Simplifying Assumption
• 1 ml of water = 1 gram of water
• 1000 ml of water = 1 liter = 1000
grams
• Assume that solutions with water as
the solvent have the density of
pure water (1 mL = 1 gram)
– It’s not true, but it’s close
enough 