Chapter 4, Problem 4.92PAE

Interpretation Introduction

Interpretation: The correct formula for the complex ion with general formula $F{e}_x{(C_{12}{H}_8{N}_2)}_y{}^{2x+}$, should be found out when the graph relevant for continuous variation method which was drawn using the spectrometer readings obtained from formed colored complex at each volume percentage of $F{e}^{2+}$ is given.

Concept introduction:

The continuous variation method can be used to get exact molar ratio of reactant. Here they have noted the change of concentration of complex ion with the volume of Fe²+ ion solution. But total volume of mixture of two solutions always remains constant.