KMnO 4 is titrated with ferrous ammonium sulphate hexahydrate in presence of dilute H 2 SO 4 . Number of water molecules produced for 2 molecules of KMnO 4 is________
Text Solution
Verified by Experts68
(68) By balancing redox reaction:
10[FeSO 4 . (NH 4 ) 2 SO 4 .6H 2 O] + 2 KMNO 4 + 8H 2 SO 4 
5 Fe 2 (SO 4 ) 3 + 2 MnSO 4 + 10(NH 4 ) 2 SO 4 + K 2 SO 4 + 68H 2 O
8H + + 
+ 5 Fe +2 
5 Fe +3 + Mn +2 + 4H 2 O
For 2 moles of MnO 4 , 8 moles of H 2 O. are released 5 moles of Mohr's salt contain 30 moles of H 2 O. So, 10 moles of Mohr's salt contain 60 moles of H 2 O So, total moles of H 2 O produced= 68
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