1. Other methods to express concentration

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

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

4. Mass percent
Mass % = mass solute (g)
mass solution (g)

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

7. 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