In an acid base titration (for example a strong acid and strong base like HCl and NaOH), at equivalence point, the number moles of acid is equal to the number of moles of base.
HCl + NaOH ---- NaCl + H2O
Moles of Acid = Moles of Base
V(HCl) * M(HCl) = V(NaOH)*M(NaOH)
Now, beyond the equivalence point as more acid is added, the resulting pH will depend on the excess acid present.
