a) atropine sulfate/sodium valproate
b) morphine sulfate/ketamine hydrochloride
c) penicillin sodium/phenytoin sodium
I believe atropine sulfate is a basic salt because sulfate originates from sulfuric acid and that would make atropine a base. Atropine sulfate would be a basic salt. Valproate originates from valprioic acid and sodium would be a base, making this a basic salt as well. The same applies to morphine sulfate as does atropine sulfate. Hydrochloride is derived from HCL a strong acid so ketamine would be a base. For c), sodium is a base so that would make penicillin and phenytoin bases.
This is what I could gather from the sources I've used. For an upcoming exam, I have to be able to identify acidic and alkaline drugs within a limited amount of time.