Chapter 23, Problem 98IE

Interpretation Introduction

Interpretation: Total volume of $\text{EDTA}$ required for the chelation of ${\text{Mg}}^{2+}$ and ${\text{Ca}}^{2+}$ in the given volume of solution and that required for only ${\text{Mg}}^{2+}$ ion in the solution are solution. The concentration of magnesium and Calcium in the hard water is to be calculated.

Concept introduction: The value of molarity is calculated by the formula,

${\text{M}}_{\text{1}}{\text{V}}_{\text{1}}={\text{M}}_2{\text{V}}_{\text{2}}$

The value of mass is calculated by the formula,

$\text{Mass(mg)}=\text{Moles}\times \text{Molar}\text{mass}$

To determine: The concentration of magnesium and Calcium in the hard water.