Lec: Parts Per Million

A solution with a concentration of 5 ppm –

tells you that there are 5 particles of solute per million particles of solution.

Parts per Million The measurement used to determine

the amount of a solute that has been dissolved in a solution.

5 ppm can be expressed as a ratio. (5:1,000,000)

To prepare a solution with a solute and solvent use the following equation.

1. Mass of the solution x %Solute = Mass of 100

Solute

2. Mass of Solution – Mass of Solute = Mass of Solvent

Determining the amount of solute and solution if the solution is 25% sugar and the mass of solution is 500g.

500g x 25% / 100 = 125g sugar

500g – 125g = 375g water

Calculate the amount of solute and solvent if the solution is 20% salt and the mass of solution is 300g.

Calculate the amount of solute and solvent if the solution is 20% salt and the mass of solution is 300g.

300g x 20 / 100 = 60g salt

300g – 60g = 240g water