Answer to Question #153311 in Physical Chemistry for Giren

Question

A standard solution of hydrated Iron (II) sulphate, FeSO4.xH2O, as prepared by dissolving 5.8g of the salt in a volumetric flask making it to 250ml (250 cm3), 25ml (25 cm3) of this solution was acidified and found to react with 22.8ml (22.8 cm3) of 0.018MPotassium permanganate solution.

i) What is the indicator for the titration of Iron(II)sulphate and Potassium permanganate solution?

ii)indicate the colour at the end point if the permanganate is in the burette.

iii)Why is it necessary to acidify the Iron(II)sulphate before titration ?

Answer 1

1 ) MnSO₄ is the catalyst and kmnO₄ is used as indicator .

2 ) color change from pupule to colorless .

3) In Acidic medium KMnO₄ Changes to Mn²⁺ So Color will change .