Chapter 8, Problem 29P

Interpretation Introduction

Interpretation:

The numbers of equivalents of each of the ions that are present in $\text{2}\text{.5}\text{mol KCl}$ and $\text{2}\text{.5}\text{mol}{\text{CaSO}}_4$ is to be calculated.

Concept introduction:

One equivalent of an ion can be defined as amount of charge an ion contributes when present in dissolved form. For example, one mole of ${\text{Mg}}^{2+}$ contributes 2 equivalent of ${\text{Mg}}^{2+}$ ions as the charge is $+2$ . Similarly one mole of ${\text{SO}}_4{}^{2-}$ contributes 2 equivalent of ${\text{SO}}_4{}^{2-}$ ions as the charge is $-2$.

To convert one system of unit to another the conversion factors are written such that the unwanted units lie in the denominator and thus are canceled out.