4

ESTIMATION OF COPPER BY IODOMETERY

AIM

To estimate the amount of copper present in 100 ml of the given solution by using approximately 0.05N sodium thiosulphate (hypo) solution.

PRINCIPLE

The estimation is based on iodometric titration. Hypo is standardised by titrating with standard potassium dichromate solution, which liberates iodine from potassium iodide in an acidic medium.

uEquation10a.png

Copper sulphate reacts with potassium iodide liberating iodine.

uEquation10b.png

The liberated iodine is titrated against hypo using starch as the indicator.

The starch indicator forms ...

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