Classical Methods of Analysis and E-Factor

Flashcards covering the titration of Iron (II) with Permanganate, basic principles of Complexometric titrations, and the calculation of the Environmental E-Factor.

Potassium permanganate

A powerful oxidising agent with a deep pink colour that serves as a self-indicator in titrimetry.

Equivalence point potential (Fe2+/MnO4- system)

The calculated potential at the equivalence point for the titration of iron (II) with permanganate, given in the text as $\frac{1.51 + 0.77}{2} = 1.14\,V$.

Indicator blank

A determination used to minimise titration error by accounting for the excess potassium permanganate required to indicate the equivalence point.

Complexometric titration

A titration characterized by a condition of equilibrium among the species involved, relating reactant concentration to the volume of titrant added.

Formation constant

An equilibrium constant (also known as an instability constant) used to construct a titration curve from the stoichiometry of a complexometric reaction.

Quadridentate ligand

A ligand (represented as L) that forms an equilibrium with a metal ion M (CN = 4) according to the reaction $M + L \rightleftharpoons ML$.

Bidentate ligand

A ligand (represented as B) that reacts with a metal ion M in a step-wise fashion, such as $M + 2B \rightleftharpoons MB_2$.

E-Factor (Environmental factor)

An indicator of pollution effect calculated as the ratio of the mass of the waste (effluent) generated in $kg$ to the mass of the desired product in $kg$.

E-Factor Formula

$\text{E-Factor} = \frac{\text{Mass of effluent produce}}{\text{Mass of desired product}}$.

Ethylene oxide effluent ratio

In the production of ethylene oxide, for every $44\,kg$ of product, $111\,kg$ of the effluent $CaCl_2$ is produced.