If an acid is strong (NB not concentrated), this means that all the hydrogen dissociates into hydrogen ions. E.G. H2SO4 --> 2H+ + SO4- NOT H2SO4 ←→ 2H+ + SO4- (not reversible). Image:Fish1.gif This article is a , and is very fishy. You can help My English Wiki by expanding it, removing the non-GCSE content or improving it.