Concept:Heat of neutralization is the heat released when one mole of
H+ from an acid reacts with one mole of
OH− from a base to form water.
Explanation:For a strong acid and a strong base, both reactants are completely ionized in water.
Therefore, the reaction is simply:
H++OH−→H2O, releasing the maximum fixed energy.
When a weak acid or weak base is used, part of the energy is consumed to ionize the weak reactant.
So the observed heat of neutralization becomes lower.
Hence, the highest heat of neutralization occurs only for complete ionization of both acid and base.
Answer:A. strong acid and strong base