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How is the reason for “why neutralizing weack acids with strong bases gives less heat” that the heat is used in ionizing the acid?

Neutralization of strong acids and strong bases is the exothermic reaction $$\ce{H+(aq) + OH-(aq) -> H2O(l) \label{R1} \tag{R1}}$$ Neutralization of weaks acids and strong bases is formally the ...
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Why does an exothermic/endothermic reaction have a negative/positive enthalpy

To address the title itself: Why does an exothermic/endothermic reaction have a negative/positive enthalpy? it is because of the definition of terms enthalpy, exothermic and endothermic. Exothermic ...
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