When acid is added to neutralize a base, the pH should decrease.
When a base is added to neutralize the acid, the pH value increases.
In all cases, the final pH value is not necessarily equal to 7.0 depending on the hydrolysis of the final salt even when stoichiometric amounts of acid and base are mixed together.
e.g. acetic acid and sodium hydroxide: end point pH > 7;
hydrochloride acid and ammonia: end point pH < 7.
Neutralization reaction does not mean that the end point pH is 7.0.
2014-03-31 00:51:24 補充:
In the answer from #001, it is wrong to say that the final pH is 7.0 when either acid or alkali is added.