Problem

Hydrated iron(II) sulfate has the formula

\text{FeSO}_4 \cdot x\text{H}_2\text{O}

. An experiment was performed to determine

x

, the amount of water of crystallization in hydrated iron(II) sulfate. 101.2 g of hydrated iron(II) sulfate (

\text{FeSO}_4 \cdot x\text{H}_2\text{O}

) was dissolved in 500

\text{cm}^3

of water. 20.00

\text{cm}^3

of this solution reacts completely with 24.00

\text{cm}^3

of 0.100

\text{mol dm}^{-3}

potassium dichromate(VI) solution. Calculate the value of

x

. The equation for the reaction is shown below.

\text{Cr}_2\text{O}_7^{2-}(\text{aq}) + 6\text{Fe}^{2+}(\text{aq}) + 14\text{H}^+(\text{aq}) \rightarrow 2\text{Cr}^{3+}(\text{aq}) + 6\text{Fe}^{3+}(\text{aq}) + 7\text{H}_2\text{O}(\text{l})