   # Tap water is often fluoridated with a sodium fluoride ( NaF ) concentration of approximately 1 ppm. If you consume 0.8 kg of tap water per day, how many grams of NaF do you consume? ### Chemistry In Focus

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

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 12, Problem 45E
Textbook Problem
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## Tap water is often fluoridated with a sodium fluoride ( NaF ) concentration of approximately 1 ppm. If you consume 0.8 kg of tap water per day, how many grams of NaF do you consume?

Interpretation Introduction

Interpretation:

The amount of NaF (in grams) consumed per day is to be calculated.

Concept Introduction:

Solutions are homogeneous mixtures made up of two components, the solute and the solvent.

The same solutes and solvents can form a number of combinations by varying their amounts. These combinations can be differentiated in terms of concentration of solutions. Concentration of a solution is defined as the amount of solute present in the given amount of solvent.

There are many ways of expressing concentration of solutions, such as mass percent, volume percent, molarity, parts per million.

Mass percent is defined as the mass of solute present in 100 g of solution.

Volume percent is defined as the mass of solute present in 100 mL of solution.

Parts per million is defined as the mass of solute present in 106 g of solution. It is used for expressing concentration when a small amount of solute is present in the solution.

It is known 1 g = 1000 mg, conversion factor for g to mg is as 1000 mg1 g

Concentration of solution (ppm) = Mass of solute  (g)Mass of solution  (g)× 106ppm

### Explanation of Solution

Given Information: Concentration of NaF in tap water is 1 ppm.

Mass of water sample is 0.8 kg.

The amount of NaF (in grams) consumed is calculated as follows:

Conversion of mass of water from kg to g is as follows:

0.8 kg = 1000 g1 kg×0.8 kg = 800 g

Mass of NaF is calculated as follows:

Concentration of NaF (ppm) = Mass of solute (NaF) (g)Mass of solution (water) (g)× 10

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