Chapter 14, Problem 14.18QAP

Interpretation Introduction

(a)

Interpretation:

The ligand-to-metal ratio in the product should be determined.

Concept introduction:

In the method of continuous variation, cation and ligand solutions which have same concentration are mixed in such a way that total number of moles of reactants and the total volume of each mixture are constant. But the mole ratio varies. Then the absorbance of the mixture is measured and absorbance is corrected. The corrected absorbance is plotted against volume fraction of one reactant. A maximum or a minimum occur at metal to ligand volume ratio equals to the combined ratio of metal to ligand.

Interpretation Introduction

(b)

Interpretation:

Average molar absorptivity of the complex and its uncertainty should be calculated.

Concept introduction:

In the method of continuous variation, cation and ligand solutions which have same concentration are mixed in such a way that total number of moles of reactants and the total volume of each mixture are constant. But the mole ratio varies. Then the absorbance of the mixture is measured and absorbance is corrected. The corrected absorbance is plotted against volume fraction of one reactant. A maximum or a minimum occur at metal to ligand volume ratio equals to the combined ratio of metal to ligand.

Interpretation Introduction

(c)

Interpretation:

K_f for the complex should be determined

Concept introduction:

In the method of continuous variation, cation and ligand solutions which have same concentration are mixed in such a way that total number of moles of reactants and the total volume of each mixture are constant. But the mole ratio varies. Then the absorbance of the mixture is measured and absorbance is corrected. The corrected absorbance is plotted against volume fraction of one reactant. A maximum or a minimum occur at metal to ligand volume ratio equals to the combined ratio of metal to ligand.