you decide it is time to clean your pool since summer is quickly approaching. your pool maintenance guide specifies that the chlorine, cl2 , 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 cl2 content. the chemist reports a chlorine concentration of 3.09×10−5 m . convert the concentration of cl2 to parts per million ( ppm ).

The concentration of a chemical solution is expressed in molarity and parts per million (ppm), two units of measurement. The molecular or atomic mass of the solute is comparable to one mole. Parts per million, naturally, refers to the quantity of solute molecules in every million parts of a solution.

How to convert molarity into ppm?

1ppm = 1mg in 1000g solution

Given chlorine concentration = 3.09X10⁻⁵M

The atomic mass of chlorine is 35.5g/mol

For Cl₂, atomic mass = 35.5*2=71g/mol

W= 3.09X10⁻⁵ X 71 = 2.19 X 10⁻³g Cl₂ per liter solution

So, W= 2.19mg/lit solution

Now, let us assume density of solution = 1

Therefore, concentration of Cl₂ = 2.19ppm

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