Long Answer TypeWith the net ionic equation for the reaction of potassium dichromate (VI), K2Cr2O7 with sodium sulphite, Na2SO3, in an acid solution to give chromium (III) ion and the sulphate ion.
Balancing of equation of ion-electron method involves the following steps:
1. Identify oxidation and reduction half reactions in noting the change in oxidation number of atoms of different species in the reaction and write them separately.
2. Balance the atoms of all elements other than hydrogen and oxygen in both oxidation and reduction half reactions separately.
3. Now add required number of electrons (towards R.H.S. in oxidation half reaction and towards L.H.S. in reduction half reaction) in order to balance the charges of the atom undergoing oxidation or reduction on both the sides of the half reactions.
4. For a reaction taking place in an acidic or neutral medium, balance oxygen atoms by adding an H2O molecule for each oxygen atom on the side deficient in oxygen atoms in each half reaction and now balance hydrogen atom by adding H+ ion for each H atom on the side deficient in hydrogen.
5. If the reaction is carried in a basic solution, change each H+ ion to a water molecule and add an equal number of OH- ions to the opposite side of the equation.
6. Add the two balanced half equations and cancel any term common to both the sides.
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