What is the plural form of salt?

Answer 1

Salt is the plural of salt because you wouldn't say salts and if you wanted to say salt as in just one grain say "a grain of salt."

If you specifically need to indicate a large amount, you can add "a lot of" before salt, or you can say cans/jars/shakers/bottles/pinches of salt. Salt is referred to as a noncount noun though, and it doesn't have a plural form in itself.

To complicate the matter, the term "smelling salts" exists, but that's a different kind of mineral, not NaCl.