Chemistry - Redox Reactions Question with Solution | TestHub

To measure the quantity of${\mathrm{MnCl}}_2$dissolved in an aqueous solution, it was completely converted to${\mathrm{KMnO}}_4$using the reaction,
${\mathrm{MnCl}}_2+{\mathrm{K}}_2{\mathrm{S}}_2{\mathrm{O}}_8+{\mathrm{H}}_2\mathrm{O}\to {\mathrm{KMnO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4+\mathrm{HCl}$(equation not balanced). Few drops of concentrated$\mathrm{HCl}$were added to this solution and gently warmed. Further, oxalic acid$\left(225 \mathrm{mg}\right)$) was added in portions till the colour of the permanganate ion disappeared. What is the quantity of${\mathrm{MnCl}}_2$(in mg) present in the initial solution? (Atomic weights in$\mathrm{g}\mathrm{ }{\mathrm{mol}}^{-1}:\mathrm{ }\mathrm{Mn}=55, \mathrm{Cl}=35.5$)