A steel sample is to be analysed fo r`Cr` and `Mn` simultaneously. By suitable treatment the `Cr` is oxidised to `Cr_(2)O_(7)^(2-)` and the Mn to `MnO_(4)^(-)` . A 10.00g sample of steel is used to produce `250.0mL` of a solution containing` Cr_(2)O_(7)^(2-)` and `MnO_(4)^(-)` (a) A `10.00mL` portion of this solution is added to a `BaCl_(2)` solution and by proper adjument of the acidity, the chromimum is completeley precipitated as `0.0549g BaCrO_(4)`. (b) A second `10.00mL` portion of this soltuion requires exactily `15.95mL` of `0.0750M` standard `Fe^(2+)` solution for its titaration (in acid solution). Calculate the `%` of `Cr` in the steel sample. `(Cr = 52, Mn = 55, Ba = 137)`

A steel sample is to be analysed fo r`Cr` and `Mn` simultaneously. By

1.	A steel sample is to be analysed fo r`Cr` and `Mn` simultaneously. By suitable treatment the `Cr` is oxidised to `Cr_(2)O_(7)^(2-)` and the Mn to `MnO_(4)^(-)` . A 10.00g sample of steel is used to produce `250.0mL` of a solution containing` Cr_(2)O_(7)^(2-)` and `MnO_(4)^(-)` (a) A `10.00mL` portion of this solution is added to a `BaCl_(2)` solution and by proper adjument of the acidity, the chromimum is completeley precipitated as `0.0549g BaCrO_(4)`. (b) A second `10.00mL` portion of this soltuion requires exactily `15.95mL` of `0.0750M` standard `Fe^(2+)` solution for its titaration (in acid solution). Calculate the `%` of `Cr` in the steel sample. `(Cr = 52, Mn = 55, Ba = 137)`
Answer» Correct Answer - `%` of `Cr = 2.821%` of `Mn = 1.496%`

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