Acids have a pH of less than 7, bases have pH that is higher, while salts are neutral with a pH of exactly 7. Acids need to be in an aqueous form in order to be an acid. Bases can be water-soluble or insoluble.
A salt is formed when an acid reacts with a base in the process of neutralization. This causes the positively charged hydrogen ion of the acid compound to be replaced by a metal ion. The product is a neutral compound with a related number of positive and negative ions. This product is a salt. Some salts are soluble in water, and others are not.