An acid-base reaction is a reaction between an acid and a base. The result of this reaction is neutralization of the acid by the base, and vice versa, resulting in a solution that is neither acidic nor basic. For this reason, acid-base reactions are often referred to as neutralization reactions.
For example, a very common acid is hydrochloric acid. The reaction between strong acid says hydrochloric acid and strong base say sodium hydroxide forms salt and water. The complete chemical equation is shown below.
HCl (strong acid) + NaOH (strong base) → NaCl (salt) + H2O (water)
In an acid-base reaction, the acid donates a proton to form a conjugate base and the base accepts a proton to form a conjugate acid. Acid/base reactions should be initiated at room temperature in the absence of light. Heat should be avoided where possible because this introduces a second variable.