One g sample of NaCN was dissolved in 50 mL of 0.33M alkaline and heated strongly…

CHEMISTRY · Subjective · ISC · Chemistry · Redox Reactions · Redox Reactions

Problem

One g sample of NaCN was dissolved in 50 mL of 0.33*M* alkaline

\text{KMnO}_4

and heated strongly to convert all the

\text{CN}^-

\text{OCN}^-

. No other species in NaCN sample undergoes oxidation. Now acidifying the resulting mixture with

\text{H}_2\text{SO}_4

, the resulting solution requires 0.5 litre of 0.06 *M*

\text{FeSO}_4

. Calculate the % purity of NaCN in sample.