Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692



Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 12, Problem 47E
Textbook Problem

A 475-mL sample of water is extracted from a well and analyzed for mercury. The mercury content is found to be 0.005 mg. What is the concentration of mercury in the well water in milligrams per liter (mg/L)? Is the water safe for human consumption?

Interpretation Introduction


The concentration of mercury in the given sample of well water is to be calculated and the water sample is safe or unsafe for human consumption is to be predicted.

Concept Introduction:

Water gets polluted due to the presence of various biological and chemical contaminants. Biological contaminants include microorganisms such as Giardia, Legionella while chemical contaminants are mercury, lead, benzene, trichloroethylene etc. Both these render water unfit for consumption by human beings and animals, if the contaminant exceeds a certain limit, termed as Maximum Contaminant Limit.

The concentration of a contaminant is reported as the mass of contaminant (in milligrams) present in one liter of water.

It is known that 1000 mL = 1 L, hence conversion factor of mm to L is as:

1000mL1 L

Concentration of solute = Mass of soluteVolume of solution

Explanation of Solution

Given Information: Mass of mercury in water sample is 0.005 mg.

Volume of water sample is 475 mL.

Conversion of volume of water from milliliters to liters is as follows:

475 mL = 1 L1000 mL×475 mL = 0.475 L

The concentration of mercury is calculated as follows:

Concentration of mercury (mg/L) = 

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Chapter 12 Solutions

Chemistry In Focus
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