The reaction between an acid and a hydroxide is known as a neutralization reaction. The products of a neutralization reaction are typically a salt and water. The salt is formed from the positively charged ions of the base and the negatively charged ions of the acid. The water is formed from the hydrogen ions of the acid and the hydroxide ions of the base.

The general equation for a neutralization reaction is:

```

acid + base -> salt + water

```

For example, the reaction between hydrochloric acid and sodium hydroxide produces sodium chloride and water:

```

HCl + NaOH -> NaCl + H2O

```

Neutralization reactions are important in a variety of chemical processes, such as the production of fertilizers, the refining of petroleum, and the treatment of wastewater.