Question

how are salts formed

Answer 1

It is typically formed by the evaporation of salty water (such as sea water) which contains dissolved Na+ and Cl- ions. One finds rock salt deposits ringing dry lake beds, inland marginal seas, and enclosed bays and estuaries in arid regions of the world.

Answer 2

when acid and base react with each other then form salt and water this process is known by neutralization .

e.g. NaOH+HCl---->NaCl+H2O