Page 57 - Chemistry - XII

MnO+8H +5e Mn+ 4H O
2+
+
4 2
Molecular weeight 158
The equivalent mass of KMnO in above reaction= = = 31.6
4
Change in oxidation state 5
∴ N = aM =5×M wherea = Molecular weight
Equivalent wweight
KMnO 4 KMnO 4 KMnO 4

M. wt. of Mohr's salt
Equivalent wt. of Mohr's salt=
1
∴ N = b.M =1×M where b= M. wt. of MMohr's salt
Mohr's salt Mohr's salt Mohr's salt
Eq.wt. of Mohr's salt

MnO+8H +5Fe Mn +5Fe +4HO
+
2+
2+
3+
4 2