Molecular and Ionic equations
On adding silver nitrate solution to a sodium chloride solution we get a white precipitate of silver chloride. Sodium chloride (a salt) is produced on mixing sodium hydroxide and hydrochloric acid in equivalent proportion. These reactions are usually represented by the following chemical equations:
Some rules that should follow while writing ionic equations are given below:
The Ion-Electron method of balancing Equation for Oxidation-Reduction Method (by use of Half reactions)
Following steps should be followed while balancing the equation by this method:
i) Add these two balanced half-reactions in such a way that the electrons appearing on the right of one half-reaction and on the left of the other cancel. For this each half-reaction will be multiply by some number before addition.
Example: write balanced equation for the oxidation of ferrous to ferric ion by dichromate ion in acid solution. The dichromate ion by dichromate yields cr3+.
For one half-Reaction
For the other Half-Reaction
Adding two half-reactions