concentrated, strong
dilute, weak
acetic, citric, folic, hydrochloric, lactic, nitric, sulphuric/sulfuric, etc.
the increasingly painful build-up of lactic acid in your muscles

amino, nucleic
fatty, trans-fatty
fish that are rich in omega-3 fatty acids

stomach

produce
neutralize
You will need a special chemical to neutralize the acid.

burn sth
The acid burned a hole in her coat.

break sth down
Stomach acids can break down the poison.

drop
They smoke joints and drop acid.

on acid
He described the music as ‘Brahms on acid’.