Question

You decide it is time to clean your pool since summer is quickly approaching. Your pool maintenance guide specifies that the chlorine, Cl 2, the concentration of the pool should be between 1 and 3 ppm. In order to determine if your pool is safe to swim in, you send a sample of pool water to a chemist for analysis of the Cl 2 content. The chemist reports a chlorine concentration of 4.23 × 10 − 5 M. Convert the concentration of Cl 2 to parts per million ( ppm ).

Answer 1

Answer:

3.00 ppm

Explanation:

The molar concentration of Cl₂ is 4.23 × 10⁻⁵ M = 4.23 × 10⁻⁵mol Cl₂/L. We want to convert this concentration to parts per million 1 ppm = 1mg/L.

We will use the following relations:

• The molar mass of Cl₂ is 70.906 g/mol.
• 1 g = 10³ mg

Then, we can use proportions:

$\frac{4.23 \times 10^{-5} molCl_{2}}{L} .\frac{70.906gCl_{2}}{1molCl_{2}} .\frac{10^{3}mgCl_{2} }{1gCl_{2}} =3.00ppm$