Question

How many grams of kmn o4 are contained in 4 litres of 0.05 N solution the kmno4 for is to be used as an oxidant in acidic medium

Answer 1

Normality of KMnO4

=Molecular Wt./5=158/6=31.6

In acidic medium KMnO4 reacts as follows. 2KMnO4+3H2SO4———-> K2SO4+2MnSO4+3H20+ 5(O)

So (2 x 158) gmKMnO4 liberates=5 x16 gmO2 So 8 gm O2 is liberated from=2 x 158/10=31.6

Now the wt.of KMNO4 present in 1 Liter of 0.05 N KMnO4=0.05 x 31.6=1.58

wt.of KMnO4 present in 4 liters of 0.05 N KMNO4 is =1.58 x 4=6.32 gm