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For the estimation of potassium permangn...

For the estimation of potassium permangnate using standard ferrous ammonium sulphate solution:
(i) Write the chemical equation for the reaction involved.
(ii) Write the equivalent mass of potassium permanganate.
(iii) Name the indicator used.
(iv) Mention the colour change at the end point.

Text Solution

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(i)`K_2Cr_2O_7 + 4H_2SO_4 to K_2SO_4 + Cr_2(SO_4)_(3) + 4H_2O xx 32`
OR
`K_2Cr_2O_7 + 6FeSO_4 + 7H_2SO_4 to K_2SO_4 + Cr_2(SO_4)_(3) + 3Fe_(2)(SO_4)_(3) + 7H_2O`
(ii) 392
(iii) Diphenylamine
(iv) Green to violet.
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