# Why is the point in the titration when neutralization occurs called the equivalence point?

For example, in the titration reaction between $\text{NaOH}$ and ${\text{H"_2"SO}}_{4}$:
$2 \text{NaOH (aq)" + "H"_2"SO"_4 "(aq)" rarr "Na"_2"SO"_4 "(aq)" + "H"_2"O(l)}$
The reaction has reached its equivalence point when the ratio of ${\text{H"_2"SO}}_{4}$ to $\text{NaOH}$ in solution is exactly $1 : 2$.