Re: why does weak acid releases less energy during neutralization than strong ?

I will assume weak-acid weak-base vs. strong-acid strong-base reactions 
for simplification. The heat released or enthalpy of neutralization is 
dependent on the concentration of H+ (H3O+) and OH- . In order for H+ to 
form, the acid-H of the molecule must ionize in solution. Strong acids 
always completely ionize in solution unless the concentration is 
extremely high, but normally this is not the case. This means that there 
is a complete neutralization of all available acid-H. Weak acids however 
by definition do not completely ionize in solution so the concentration 
of H+ is never equal to the total available acid-H. Therefore full 
neutralization of the acid is never achieved and so cannot produce as 
much heat as the same molar amount of a strong acid.