Final answer:
When positive ions from a base and negative ions from an acid combine, they form a salt. Salts are ionic compounds formed through neutralization reactions between acids and bases, and they can be seen in reactions such as the reaction between hydrochloric acid and sodium hydroxide which produces water and sodium chloride as the salt.
Step-by-step explanation:
When positive ions from a base and negative ions from an acid combine, they form a salt.
Salts are ionic compounds that are formed by the reaction between an acid and a base. This reaction, called neutralization, results in the formation of water and a salt.
For example, the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) produces water (H2O) and sodium chloride (NaCl), which is a salt:
HCl + NaOH → H2O + NaCl