1. Other methods to express concentration

2. There are several different ways to express concentration
Grams per liter (C=g/L)
Volume percent (%v/v)
%v/v= vol. solute (ml)
vol. solution (ml)

3. What is the volume % of 15 ml of pure alcohol dissolved in 250 ml of water?
%v/v = vol solute (ml)
vol. solution (ml)
= 15/ 265 (alcohol + water)
= (X 100 to convert to a %)
= 5.6% v/v

4. Mass percent (%m/m)
%m/m = mass solute (g)
mass solution (g)
To convert from %v/v, %m/m or % m/v to g/L all you do is multiply by 10.

5. Concentration in parts per million (ppm)
Used when the concentration of solute is extremely small
The number of parts of solute in 1 million parts of solution
1 ppm = 1 g of solute in g of solution

6. What is a ppm? 1 ppm = 1 g/ 1 000 000 g 1 ppm = 1 mg/ kg
1ppm = 1 g / 1000L
1ppm = 1 mg/ L

7. To convert from g/L to ppm you multiply by 1000
Ex: 5 g/L = 5000 ppm
Get it?