1. Unit 5: Solutions
ppm and ppb

2. ppm (parts per million)
used to represent very dilute solutions
ppm: one part solute in 1,000,000 parts water
This is like 1 second of time in 11.5 days!

3. ppm (parts per million)
Example:
A g sample of pond water is found to have g of Ca3(PO4)2. What is the concentration of Ca3(PO4)2 in ppm?

4. ppb (parts per billion)
used to represent very dilute solutions
ppb: one part solute in 1,000,000,000 parts water
This is like 1 second of time in 31.7 years!

5. ppb (parts per billion)
Example:
An article says that researchers found g of mercury in a 1000 kg sample of water. What is the concentration of mercury in ppb?