Memory Alpha
Memory Alpha
Multiple realities
(covers information from several alternate timelines)

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 USS Enterprise's crew were being held by Krall. (Star Trek Beyond)

Dr. Sevrin committed suicide by eating acid-laced fruit. (TOS: "The Way to Eden")

A Horta acid tunnel

The Horta could tunnel through rock by producing an acid. (TOS: "The Devil in the Dark")

Leonard McCoy and his mirror self 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. (TOS: "Mirror, Mirror")

A barrel of acid spilling its contents

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


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