What are strong acids or bases are that ionize or dissociate in aqueous solution?
Strong acids and bases are those which have the tendency to easily dissociate into ions in aqueous solution.
Strong acids and strong bases are those species which dissociate/ionize essentially to completion upon being placed in aqueous solution.
Dissociation of a strong acid (hydrochloric for example):
#"HCl"(g) rarr "H"^+(aq) + "Cl"^(-)(aq)#
Dissociation of a strong base (sodium hydroxide for example):
#"NaOH"(s) rarr "Na"^+ (aq) + "OH"^(-) (aq)#
Substances that ionize completely (which include strong acids and bases) are called strong electrolytes, and further include basically all water-soluble ionic compounds.
For a list of the strong acids and bases, try this:
For sulfuric acid,