The reaction between an acid and a base is called neutralization. This reaction results in the formation of a salt and water. Acids are substances that donate protons (H+ ions), while bases are substances that accept protons. When an acid and a base react, the protons from the acid are transferred to the base, forming a salt and water. For example, when hydrochloric acid (HCl) and sodium hydroxide (NaOH) react, the following neutralization reaction occurs:

HCl + NaOH → NaCl + H2O

In this reaction, the H+ ions from HCl are transferred to the OH- ions from NaOH, forming sodium chloride (NaCl) and water (H2O). Neutralization reactions are important in many chemical processes, including the production of salts, the removal of acidity or basicity from a solution, and the regulation of pH levels in various systems.