How do we assess whether an acid is strong in aqueous solution?
Acidity is an experimental phenomenon, and strong acids behave as strong acids do in water.
In general when hydrogen is bound to a strongly electronegative atom, then that hydrogen is acidic. However, this criterion fails when we consider the acidity of say
As with every other reaction, we look at the reaction itself:
Anions for which the negative charge is delocalized, i.e.
So, you just have to learn the common strong acids.