How do you calculate 100 ppm?

To calculate 100 parts per million (ppm), you can use the formula: ppm = (mass of solute / mass of solution) × 1,000,000. For example, if you have 100 mg of a substance in 1 liter (1,000,000 mg) of solution, the calculation would be (100 mg / 1,000,000 mg) × 1,000,000 = 100 ppm. This means that in a solution, there are 100 parts of the solute for every million parts of the total solution.