Chapter 19, Problem 19.106QP

Interpretation Introduction

Interpretation:

The molar concentration of ${\text{Fe}}^{3+}$ and ${\text{Fe}}^{2+}$ in the given solution has to be found.

Concept Introduction:

Titration is a widely used method for the determination of unknown concentration of an analyte.  In order to determine the unknown concentration, the analyte of known volume is titrated with the titrant of known volume and concentration.  The unknown concentration of the analyte is found by the following equation.

  ${\text{V}}_{\text{1}}{\text{N}}_{\text{1}}{\text{=V}}_{\text{2}}{\text{N}}_{\text{2}}$

Where,

  ${\text{V}}_{\text{1}}$ is the volume of the analyte

  ${\text{N}}_{\text{1}}$ is the unknown concentration of the analyte

  ${\text{V}}_{\text{2}}$ is the volume of the titrant

  ${\text{N}}_{\text{2}}$ is the concentration of the titrant

This formula is applicable when one mole of analyte is reacting with one mole of the titrant.

After calculating the unknown concentration of the analyte, its weight is gram is calculated

Mole is the mass of the substance that is having Avogadro number of particles.  The number of moles of a given substance can be calculated by multiplying its volume with concentration

Molar concentration or molarity is the ratio of number of moles of solute to the volume of the solution in litre.