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A sample of FeSO(4).7H(2)O crystals has ...

A sample of `FeSO_(4).7H_(2)O` crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total `250 cm^(3)` water and dilute sulphuric acid. `25cm^(3)` portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was `0.1"mol"dm^(-3)`. The averge volume used was `23.5cm^(3)` o.2 mol `dm^(-3)`. The average volume used to `23.5cm^(3)`.
How many moles of `Fe^(+2)` ions would there havebeen in the `250 cm^(3)` of stock solutio?

A

`7.05xx10^(-4)` mol

B

`2.35xx10^(-4)` mol

C

`1.41xx10^(-2)` mol

D

`7.05xx10^(-4)` mol

Text Solution

Verified by Experts

The correct Answer is:
C
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A sample of FeSO_(4).7H_(2)O crystals has been left open to the air and some of the iron (II) has been converted to iron (III). 4.2 gm of the impure crystals were dissolved in a total 250 cm^(3) water and dilute sulphuric acid. 25cm^(3) portion of this solution was titrated with a solution of potenssium bicarbonate. The concentration of dichromate (VI) ions in this solution was 0.1"mol"dm^(-3) . The averge volume used was 23.5cm^(3) o.2 mol dm^(-3) . The average volume used to 23.5cm^(3) . What mass of Fe^(+2) ions should have been present in the 4.2 gmiof crystalsl?

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