Chapter 18, Problem 51E

Interpretation Introduction

Interpretation:

The moles of
$\text{Ca}{\left(\text{OH}\right)}_{\text{2}}$ and ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}$ that should be added to soften $1200\text{L}$ of water is to be calculated.

Concept introduction: The number of moles is defined as the ratio of mass with the molecular mass of an element. The mass of an element is the amount of the substance present in an element. The molar mass is the ratio of the given mass to the number of moles in a given species.

To determine: The moles of $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}$ and ${\text{Na}}_{\text{2}}{\text{CO}}_{\text{3}}$ that should be added to soften $1200\text{L}$ of water.