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The heat of neutralization of a strong acid with strong base is always the same. Why?

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Strong acids, strong bases and their salts ionize completely in the solution. Consider the neutralization of hydrochloric acid by sodium hydroxide, which is as follows:

acids-bases-and-salts-icse-solutions-for-class-10-chemistry-14
This shows that heat of neutralization of a strong acid by a strong base is nothing, but heat of formation of water molecule from hydrogen and hydroxyl ions, hence it is in the same and fixed quantity.

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