Question

Why is dil H2SO4 is added to the eletrolytiel solution?

Answer 1

Because water is an insulator. 100% pure water doesn't conduct electricity very well at all. When acid such as sulfuric acid (H2SO4) is added, the compounds separate into separate ions and having that small number of ions increases conductivity astronomically. This doesn't require an acid, you can use a base or almost any compound. Even normal tap water has enough ions to be a good conductor, which is necessary to efficiently perform electrolysis