Parts per Million (ppm) and  Parts per Billion (ppb) Worksheet

1.  Suppose 17.0 mg of sucrose is dissolved in 183 g of water. What is the concentration of sucrose in ppm?

2.  35.0 μg of ethanol is dissolved in 115.0 g of water.  What is the concentration of ethanol in parts per billion (ppb)?

3.  28.4 mg of Na₂CO₃ is dissolved in 300 mL of water at 10ºC. What is the concentration of Na⁺ in ppm?

4.  The solubility of AgCl is 0.0080 g / 100 grams of water.  What is this concentration in ppm?

5.  A certain pesticide has a toxic solubility of 5.0 grams per kg of body weight.  What is this solubility in ppm?

6.   The molar concentration of a solution of K₃PO₄ is 4.55 × 10^-5 mol/L. What is the K⁺ concentration in ppm?

Answers:

1.   92.9 ppm               2.    304 ppb                3.   41.1 ppm                4.  80. ppm             5.   5.0 × 10³ ppm

6.   5.34 ppm