# A 255-mL sample of water is taken from a tap and analyzed for trichloroethylene ( TCE, formula C 2 HCl 3 ) . The TCE content is 0.012 mg. What is the concentration of TCE in the water in mg/L? Is the water safe for human consumption?

### Chemistry In Focus

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

Chapter
Section

### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 12, Problem 48E
Textbook Problem
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## A 255-mL sample of water is taken from a tap and analyzed for trichloroethylene ( TCE, formula C 2 HCl 3 ) . The TCE content is 0.012 mg. What is the concentration of TCE in the water in mg/L? Is the water safe for human consumption?

Interpretation Introduction

Interpretation:

The concentration of TCE in the given sample of tap water is to be calculated and whether 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 in it. 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 1000 mL = 1 L, hence conversion factor is as: 1 L1000 mL

Concentration of solute = Mass of soluteVolume of solution

### Explanation of Solution

Given Information: Mass of TCE in water sample is 0.012 mg.

Volume of water sample is 255 mL.

Conversion of volume of water from milliliters to liter is as:

255 mL = 1 L1000 mL×25mL = 0

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