# How can I balance neutralization reactions?

For example, if you must neutralize aluminium hydroxide $A l {\left(O H\right)}_{3}$ with sulphuric acid ${H}_{2} S {O}_{4}$, so you have three hydroxide ions per base formula and two hydrogen ions given per acid formula, you should take three sulphuric acid molecules per two aluminium hydroxide units to make up as many hydrogen ions (six) as many hydroxide ions (six) and obtain the same number of water molecules:
$3 {H}_{2} S {O}_{4}$ + $2 A l {\left(O H\right)}_{3}$$A {l}_{2} {\left(S {O}_{4}\right)}_{3}$ + $6 {H}_{2} O$