Both Cr_(2)O_(7)^(2-) (aq) and MnO_(4)^(-) (aq) can be used ot titrate Fe^(2+)(aq) if in a given titration 24-50 cm^(3)0.1 M Cr_(2)O_(7)^(2-) were used then what volume of 0.1 M MnO_(4)^(-) solution would have been use for the same titration ?

Both Cr_(2)O_(7)^(2-) (aq) and MnO_(4)^(-) (aq) can be used ot titrate

1.	Both Cr_(2)O_(7)^(2-) (aq) and MnO_(4)^(-) (aq) can be used ot titrate Fe^(2+)(aq) if in a given titration 24-50 cm^(3)0.1 M Cr_(2)O_(7)^(2-) were used then what volume of 0.1 M MnO_(4)^(-) solution would have been use for the same titration ?
Answer» Solution :The balaced redox reaction involving oxidation f `Fe^(2+)` ions by `Cr_(2)O_(7)^(2-) "and" MnO_(4)^(-)` respectively are `Cr_(2)O_(7)^(2-)+6Fe^(2+)14H^(+)rarr2Cr^(3+)+6Fe^(3)+7H_(2)O` `MnO_(4)^(-)+5Fe^(2+)+8H^(+)rarrMn^(23+)+5Fe^(3+)+4H_(2)O` Suppose `V_(2) cm^(3)"of"M_(2)F^(2+)` is titreated against 24.50 `cm^(3)` of 0.1 M `Cr_(2)O_(7)^(2-) "and" V_(1)cm^(3) of 0.1 M MnO_(4)^(-)` solution then `(24.5xx0.1)/(1)(Cr_(2)O_(7)^(2-))=(M_(2)B_(2))/(6)(Fe^(2+))` `(V_(1)xx0.1)/(1)(MnO_(4)^(-))=(M_(2)V_(2))/(5)(Fe^(2+))` Equating (i) and (II) `V_(1)=2.45xx6/5=29.4 cm^(3)`