Sodium chloride is a quest item found in Recruitment Drive during the Miss Cheevers challenge. It is picked up along with many useful ingredients from shelves in the room, but is not necessary to complete the challenge. If the sodium chloride is mixed incorrectly into the other ingredients it may produce one of the ??? mixtures or the strange tin.
Sodium chloride is the scientific name for table salt.
When used with dihydrogen monoxide, the character says "I have no time for brine!", which is a term for saltwater.