Acid
An acid was a water-soluble compound with a pH of less than 7. It was an ion or molecule that could give up a proton to a base, or accept an unshared pair of electrons from such a base. In a reaction with an alkali, the two compounds would create water and a salt. This salt was different with different combinations of acid and alkali.

In 2263 of the alternate reality, a green goo that Keenser kept expelling whenever he sneezed was highly acidic, so much so that it was able to unlock the door to a holding area where several members of 's crew were being held by Krall. ()

Dr. Sevrin committed suicide by eating acid-laced fruit. ()

The Horta could tunnel through rock by producing an acid. ()

Leonard McCoy and  both caused spilled acid on tables in their respective sickbays in 2266, creating a duplicate burn mark on each of them. McCoy noted the damage in 2267 as one thing which hadn't changed, as opposed to the rest of the mirror sickbay, which was disorganized and arranged differently than he left it. ()

After Captain Carol Freeman banned "buffer time" on the  in 2380, an overworked Ensign Sam Rutherford accidentally knocked over a barrel of acid, which proceeded to eat a hole in the deck. ()

Acids 
Amino acid
Cholic acid
Deoxyribonucleic Acid
Digestive acid
Folic acid
Lactic acid
Nitric acid
Nucleic acid
Orientine acid
Polytrinic acid
Xylathoric acid

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 Acid