Chapter 12, Problem 45E

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 ${10}^6$ g of solution. It is used for expressing concentration when a small amount of solute is present in the solution.

It is known $\text{1 g = 1000 mg}$, conversion factor for g to mg is as $\frac{\text{1000 mg}}{\text{1 g}}$

$\text{Concentration of solution (ppm) = }\frac{\text{Mass of solute (g)}}{\text{Mass of solution (g)}}\times {\text{ 10}}^6\text{ppm}$