What is neutralization of an acid?

Hi,
An acid has PH lower than 7 (smaller value for PH means that the solution is more acid).   Neutralization means increasing the PH and bring it to 7 (that's the PH of water).  
Best regards,

A chemical change takes place when an acid reacts with a base. Depending on the pH strength of the acid or base, neutralization may occur. If a base neutralizes an acid, there is no longer an acid or a base in solution and the solution would, therefore, lose its acid or basic properties. A neutral solution has a pH value of 7.

Okay, folks, we're into ionic chemistry. 

1.  Learn the rules of stochiometry.

2.  Learn a bit of quantum theory. 

Onward.  Let's presume you have two solutions: 1 mol HCl, and 1 mol NaOH.

Both ions dissociate in H/2\O forming:

H+ -- HOH -- Cl-  The other solution is Na+ -- HOH --OH-

So far, so good.  Now, it becomes a bit counterintuitive.

H+ -- HOH -- OH- = 2 H/2\O

Na+ -- Cl- = NaCl

Now, we have a stable salt, and water.  Does that make sense?