How To Balance Redox Reactions

Hi, I am Donald Sinclair. I am giving speeches for great London Tutors. Now, I am presenting few topics on chemistry.

This is how to balance redox reactions. Coming to balancing redox reactions in chemistry is vital. A simple example is the electrolysis of lead bromide.

Lead bromide, when it becomes molten is simply electrolysed. Lead ions which have a charge of +2 and bromide ions which have -1 charge. When electricity is passed through it, positive lead ions attract towards cathode and negative bromide ions attract towards anode.

They become neutral by loosing or gaining electrons. Losing electrons is oxidation. Gaining electrons is reduction.

Thus, reduction is redox oxidation which is redox reaction. This can be easily remembered by the phonemic OILRIG which means oxidation is losing electrons and reduction is gaining electrons. The lead ions move towards the cathode which is negatively charged because of it's abundance of electrons.

The lead ions become lead atoms by gaining 2 electrons from the cathode. The bromine ions move towards the anode which is positively charged and they lose one electron yielding bromine gas. Balance the equation in quantity.

So 2 bromide ions combine together to form one single bromine molecule. .