Chemistry - Mole Concept Question with Solution | TestHub

To a 10 ml, 1M aqueous solution of$\mathrm{B}{\mathrm{r}}_2$, excess of NaOH is added so that all$\mathrm{B}{\mathrm{r}}_2$is disproportionated to$\mathrm{B}{\mathrm{r}}^{-}$and$\mathrm{B}\mathrm{r}{\mathrm{O}}_3^{-}$. The resulting solution is made free of$\mathrm{B}{\mathrm{r}}^{-}$by extraction and excess of$\mathrm{O}{\mathrm{H}}^{-}$is neutralised by acidifying the solution. The resulting solution is sufficient to react with 2g of impure$\mathrm{C}\mathrm{a}{\mathrm{C}}_2{\mathrm{O}}_4$(M = 128 g/mole) sample. Which of the following is the correct % purity of oxalate sample