Question

To prepare M/50 solution of ferrous ammonium sulphate (mohr’s salt) using this solution, findout the molarity of the given KMno4

Answer 1

The molarity is 1/50 M.

That is its meaning.

Answer 2

Dear Student,

◆ Determining the molarity of the given KMnO4 solution -

Take known volume of KMnO4 solution and titrate it against Mohr's salt of known concentration.

Reaction for this titration is -

2KMnO4 + 10FeSO4(NH4)2SO4.6H2O + 8H2O → K2SO4 + 2MnSO4 + 5Fe2(SO4)3 + 10(NH4)2SO4 + 68H2O

Molarity of KMnO4 is determined by formula -

M(KMnO4)×V(KMnO4) / M(Mohr's salt)×V(Mohr's salt) = 2/10

M(KMnO4)×V(KMnO4) / (1/20)×V(Mohr's salt) = 2/10

M(KMnO4) = V(Mohr's salt) / 100V(KMnO4)

Thanks dear. Hope this helps you...