How to Calculate the Amount of Solute in Water given the Concentration in ppm

What is the concentration of the substance found in water when its concentration is 3.5 ppm?

a. 0.035
b. 0.35
c. 03.5
d. 035

Answer:

The correct answer is a. 0.035. When a substance is found in water and its concentration is 3.5 ppm, it means there are 0.035 mg of the solute in every liter of the water.

PPM (parts per million) is a unit used to express the concentration of a substance in a solution. It indicates the number of parts of a substance per million parts of the solution. For example, 1 ppm means that there is 1 part of the substance in every million parts of the solution.

In this case, the concentration of the substance is 3.5 ppm. This means that there are 3.5 parts of the substance in every million parts of the water. To convert this to milligrams per liter (mg/L), we need to know the density of water. The density of water is approximately 1 g/mL or 1000 mg/L. Therefore, 1 ppm is equivalent to 1 mg/L.