Question:
The volume, in $\mathrm{mL}$, of $0.02 \mathrm{M} \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution required to react with $0.288 \mathrm{~g}$ of ferrous oxalate in acidic medium is ______________ (Molar mass of $\mathrm{Fe}=56 \mathrm{~g} \mathrm{~mol}^{-1}$ )
Solution:
(50)
M. eq. of $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}=\mathrm{M}$. eq. of $\mathrm{FeC}_{2} \mathrm{O}_{4}$
$\mathrm{FeC}_{2} \mathrm{O}_{4}+\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \longrightarrow \mathrm{Fe}^{3+}+\mathrm{CO}_{2}+\mathrm{Cr}^{3+}$
$V \times 0.02 \times 6=\frac{0.288}{144} \times 3 \times 1000$
$\mathrm{V}=50 \mathrm{~mL}$
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