What is the chemical formula of salt?

Sodium Chloride ##Na^(+1)## + ##Cl^(-1)## These two combine through an ionic bond to form Sodium Chloride, a formula of NaCl.

This is only one type of salt however.

There are many types of salts, such as:

##MgCl_2## Magnesium Chloride KCl Potassium Chloride LiF Lithium Fluoride

Just to name a few. Sodium Chloride is plain old table salt that you can put on your food.