Question

A sample of drinking water was contaminated with chloroform chcl3 having level of contamination 15 ppm (by mass). The percentage concentration of chcl3 by mass in water is

Answer 1

Answer:

The percentage concentration of chloroform by mass in water is 0.0015%.

Explanation:

1 ppm means that 1 milligram substance in 1 kg of solvent.

Level of contamination of chloroform =15 ppm

This 15 mg of chlorine is present 1 kilo gram of water.

Mass of chloroform = 15 mg

Mass of water = 1 kg = 1,000,000 mg

The percentage concentration of chloroform by mass in water is:

$\frac{15 mg}{1,000,000 mg}\times 100=0.0015\%$