To prepare a solution of Sodium Thiosulphate and standardise it by titration against a solution of iodine

Step 1

Weigh thiosulfate crystals on a weigh boat

Step 2

Dissolve it in a beaker of water. Transfer it into a volumetric flask and make up to the graduation mar and invert it

Step 3

Pour potassium iodide and sulfuric acid and KMnO4 to the conical flask

Step 4

Pour sodium thiosulfate into the burette

Step 5

Titrate until brown solution turns a straw yellow and then add starch. Continue until solution turns colourless

Colour change of this experiment

Brown to straw yellow to colourless

What colour does the solution turn to once starch is added?

Blue/black

Draw a diagram of this experiment