In neutral or faintly alkaline solutions:
(a) A notable reaction is the oxidation of iodide to iodate:
2MnO4
– + H2O + I
– ——> 2MnO2 + 2OH
– + IO3
–
(b) Thiosulphate is oxidised almost quantitatively to sulphate:
8MnO4
– + 3S2O3
2– + H2O ——> 8MnO2 + 6SO4
2– + 2OH
–
(c) Manganous salt is oxidised to MnO2; the presence of zinc sulphate
or zinc oxide catalyses the oxidation:
2MnO4
– + 3Mn
2+ + 2H2O ——> 5MnO2 + 4H
+
Note: Permanganate titrations in presence of hydrochloric acid are
unsatisfactory since hydrochloric acid is oxidised to chlorine Uses
Uses
Uses
Uses
Uses: Besides its use in analytical chemistry, potassium permanganate is
used as a favourite oxidant in preparative organic chemistry Its uses for the
bleaching of wool, cotton, silk and other textile fibres and for the decolourisation
of oils are also dependent on its strong oxidising power THE INNER TRANSITION ELEMENTS ( f-BLOCK)
The f-block consists of the two series, lanthanoids (the fourteen elements
following lanthanum) and actinoids (the fourteen elements following
actinium)