The EPA\'s secondary standards for contaminants that may cause cosmetic or aesth

Question

The EPA's secondary standards for contaminants that may cause cosmetic or aesthetic effects in drinking water suggest an upper limits for the ppm concentration of these contaminates. The chloride ion is such a contaminate due to the ion giving the water a salty taste. The atomic weight of chloride ion is 35.45 g/mol.

What is the of parts per million (ppm) concentration of chloride ion in the tank if its molarity is 7.060103M?

How many grams of chloride ion are in 2.55104 liters of water in a storage tank if the concentration is at the maximum ppm allowed by the EPA?

Explanation / Answer

Molarity = 7.060 x 10^-3 M

             = 7.060 x 10^-3 mol / L

ppm = 7.060 x 10^-3 x 35.45

        = 0.2503 g / L

ppm = 250.3 ppm

volume = 2.55 x 10^4 L

Molarity = moles / volume

7.060 x 10^-3 = moles / 2.55 x 10^4

moles = 180.03 mol

mass of chloride ion = 180.03 x 35.45

                                = 6382 g

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