Chapter 12, Problem 12.35P

Interpretation Introduction

Interpretation:

The required volume of ${\text{Zn}}^{\text{2+}}$ should be calculated in the back titration of $\text{EDTA}$.

Concept introduction:

Back titration:

Back titration is a one of the titration method, which is find the excess of $\text{EDTA}$ present in solution by known second metal solution.

In the $\text{EDTA}$ titrations, metal ion slowly react with $\text{EDTA}$, metal get precipitate the absence of $\text{EDTA}$, it block the indicator are will happen so the titration may get error. In this time back titration is used to avoid these type of errors.

Mole:

The number of the solute that present in taken mass of sample is given by mole of the sample.

The molar mass of the sample contains $\text{6}\text{.023}\times {\text{10}}^{23}$ number of units, therefore $\text{6}\text{.023}\times {\text{10}}^{23}$ units is known as 1 mole.

Mole of the solute in solution is calculated by the product of concentration of the solution with volume of the solution.

$\text{Mole}\text{=}\text{Concentration}\text{(molarity)×}\text{Volume}\text{(liter)}$