Analytical Chemistry Question 187
Question: 3.92 g of ferrous ammonium sulphate react N completely with $ 50ml\frac{N}{10}KMnO_4 $ solution. The percentage purity of the sample is
Options:
A) 50
B) 78.4
C) 80
D) 39.2
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Eq of $ KMnO_4 $ used $ =\frac{50\times 1}{1000\times 10}=0.005 $
$ \therefore $ Eq of FAS reacted = 0.005
$ \therefore $ weight of FAS needed $ =0.005\times 392=1.96g $
BETA
