The volume, in mL, of 0.02 M ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution required to react with 0.288 g of ferrous oxalate in acidic medium is____.

 (Molar mass of Fe = 56 g mol-1)

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+2{\mathrm{FeC}}_2{\mathrm{O}}_4+7{\mathrm{H}}_2{\mathrm{SO}}_4\to {\mathrm{K}}_2{\mathrm{SO}}_4+{\mathrm{Cr}}_2{\left({\mathrm{SO}}_4\right)}_3+{\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3+4{\mathrm{CO}}_2+7{\mathrm{H}}_2\mathrm{O}$

one mole of potassium dichromate reacts with 288 grams of ferrous oxalate

(Gram molecular weight of ${\mathrm{FeC}}_2{\mathrm{O}}_4$ 56+24+64= 144g)

$\begin{array}{ll}\frac{V_1\times 0.02}{1}=\frac{2}{2}& \\ V_1=\frac{1}{0.02}=50\mathrm{ml}& \end{array}$