Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.
Explanation:
Generally, acids (weak or strong) dissociate to produce hydrogen ions, while bases (weak or strong) dissociate to produce hydroxide ions.
Strong bases dissociate completely to produce hydroxide ions.
But, weak bases do not dissociate completely to produce hydroxide ions, they dissociate by a percent depending on the strength of the base.
So, the right choice is:
Only some of the molecules of a weak base dissociate to produce hydroxide ions when mixed with water, but all of the molecules of a strong base dissociate to produce hydroxide ions.
