2MnO2 � 4KOH � O2 ���� 2K2MnO4 � 2H2O 4H � �
3MnO 2 4 � ���� 2MnO4 � � MnO2 � 2H2O
Or
Commercially it is prepared by the alkaline oxidative fusion of MnO 2 followed by the electrolytic oxidation of manganate ( Vl ). fused with KOH 2��
MnO
MnO
2 in the presence of O2 or KNO3 4
�manganate ions�� 2�� electrolytic oxidation in alkaline medium ��
MnO4
�Green ��
�����������������MnO4
�Purple��
( ii ) In laboratory , Mn ² + salt can be oxidized by peroxo disulphate ion to permanganate ion .
2Mn 2 + + 5S O 2- + 8H O ���� 2MnO ��
� 10SO 2� � 16H �� 2 8 2 4 4
13 . Potassium permanganate acts as a strong oxidizing agent in acidic , neutral or faintly basic medium .
In acidic medium .
MnO
- 4 + 8 H + + 5 e - Mn 2 + +
4 H 2 O In neutral or faintly basic