Oxidation of iron (II) to iron (III)
using acidified potassium manganate (VII)
The oxidation of
iron (II) Fe2+ ions to Fe3+ ions using acidified
potassium managate (VII) KMnO4 is an example
of a redox reaction.
The half equation for the reduction of the manganate (VII) ions (purple) to manganese (II) ions (colourless) is
The half equation for the reduction of the manganate (VII) ions (purple) to manganese (II) ions (colourless) is
5e- +
8 H+ + MnO4-
→ Mn2+
+ 4 H2O(g)
a) There is a gain
of
electrons
for the
manganate (VII) ions
b) The oxidation number / state of the manganate (VII) ions +7; and it has been reduced to +2 (manganese (II) ions).
b) The oxidation number / state of the manganate (VII) ions +7; and it has been reduced to +2 (manganese (II) ions).
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Pengoksidaan
ferum (II) kepada ferum (III) menggunakan larutan kalium manganat
(VII) berasid merupakan contoh tindak balas
redoks.
Persamaan separuh penurunan ion manganat (VII) (larutan ungu) ke ion mangan (II) (larutan tak berwarna) adalah seperti berikut
Persamaan separuh penurunan ion manganat (VII) (larutan ungu) ke ion mangan (II) (larutan tak berwarna) adalah seperti berikut
5e-
+
8 H+ + MnO4-
→
Mn2+
+ 4 H2O(g)
a) Ion manganat (VI) menerima elektron dan diturunkan
b) nombor pengoksidaan ion manganat (VII) +7 diturunkan kepada +2 bagi ion mangan (II)