Chapter 16, Problem 16.24P

Interpretation Introduction

Interpretation:

The technique (either iodimetry or iodometry) in which starch indicator does not added until just before the endpoint has to be predicted and the reason has to be given.

Concept introduction:

Iodimetry: Reducing analyte is treated with Iodine $\left({\text{I}}_{\text{2}}\right)$, it produces iodide $\left({\text{I}}^{-}\right)$.

Iodometry: An oxidising analyte is added to excess iodide to give iodine.  Then it is titrated with standard thiosulfate solution.