The solubility of AgCl is 8 grams / kg of water. What is this concentration in ppm ?

Answer 1

For this question, we will use the following equation:

ppm = (mass of solute ÷ mass of solution) x 1,000,000.

The mass of solute will the the AgCl.

The mass of solution will be 1000 g, which is equal to 1 kg.

ppm = (8/1000) * 1,000,000 = 8,000

The concentration is 8,000 ppm.

As a side note, future problems may require you to add the grams of solute to the solvent. For example, if a problem says to determine the concentration in ppm of a 10 gram AgCl dissolved in 1 kg of water, the mass of solution would be 1010. However, from the way the posted problem is worded the solvent already contains the 8 grams of AgCl.

Answer 2

ppm = mg/1000 g = mg/kg

8 g x 1000 mg/g = 8000 mg

8000 mg/1000 g = 8000mg/1kg = 8000 ppm