Question

What are permanent salt.​

Answer 1

Salts with which no amount of water do not bring a change in the salts .For Example CaSO4

Answer 2

The chloride of sodium, a substance used for seasoning food, for the preservation of meat, etc. It is found native in the earth, and is also produced, by evaporation and crystallization, from sea water and other water impregnated with saline particles.