Find out the percentage purity of KMnO4 if 2g impure sample of KMnO4 requires 40ml of 0.5M ferrous oxalate for complete reduction in acidic medium.

Question

Find out the percentage purity of KMnO4 if 2g impure sample of KMnO4 requires 40ml of 0.5M ferrous oxalate for complete reduction in acidic medium. (A) 80.5 % (B) 56.4 % (C) 72.3 % (D) 94.8 %

Tardigrade Admin · Accepted Answer

(w t ./158)× 5× 1000=40× 0.5× 3 wt. =1.896 % purity=(1.896/2)× 100=94.8 %

Q. Find out the percentage purity of $K M n O_{4}$ if $2 g$ impure sample of $K M n O_{4}$ requires $40 m l$ of $0.5 M$ ferrous oxalate for complete reduction in acidic medium.

$80.5%$

$56.4%$

$72.3%$

$94.8%$

$\frac{wt .}{158} \times 5 \times 1000 = 40 \times 0.5 \times 3$
$wt . = 1.896$
$% p u r i t y = \frac{1.896}{2} \times 100 = 94.8%$

Q. Find out the percentage purity of KMnO4​ if 2g impure sample of KMnO4​ requires 40ml of 0.5M ferrous oxalate for complete reduction in acidic medium.

80.5%

56.4%

72.3%

94.8%