Answer: 1. water
Explanation:
Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.
\(HX+BOH\rightarrow BX+H_2O\)
When hydrochloric acid ad sodium hydroxide combines, the \(H^+\) ions from acid combines with \(OH^-\) ions from base to form water and sodium chloride \(NaCl\) which is soluble in water.
\(HCl+NaOH\rightarrow NaCl+H_2O\).
Thus water is always produced in the reaction between hydrochloric acid and sodium hydroxide.
