Consider the titratonof potassium dichromate solution with acidfied mohr salt solution using dmiethylamine as incdicator the number of moles of mohr salt required per mole of dichromate

Consider the titratonof potassium dichromate solution with acidfied mo

1.	Consider the titratonof potassium dichromate solution with acidfied mohr salt solution using dmiethylamine as incdicator the number of moles of mohr salt required per mole of dichromate
Answer» 3 4 5 6 Solution :Mohr 's salt `[FeSO_(4).(NH_(4))_(2)SO_(4).6H_(2)O]` is a reducing agent involving 1`E^(-)` change while `K_(2)Cr_(2)O_(7)` is an oxidising agent invoving 6 `e^(-)` change i.e `Fe^(2+)RARRFE^(3+)+e^(-)]xx6` `Cr_(2)O_(7)^(-)+14H^(+)+6e^(-)rarr2Cr^(3+)+7H_(2)O` `6Fe^(2+)+Cr_(2)O_(7)^(2-)+14H^(+)rarr6Fe^(3+)+2Cr^(3+)+7H_(2)O` thus 1 mole of `Cr_(2)O_(7)^(2-)` ION will oxidise 6 MOLES of Mohr 's salt