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Pharmaceutical Physical Chemistry: Theory and Practices by S. K. Bhasin

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Experiment 19

OBJECT

To determine the heat of neutralization of a strong acid, (HCl) and a strong base (NaOH).

THEORY

Heat is given out during neutralization of an acid with an alkali. Known quantities of the standard solutions of the acid and alkali are mixed in a calorimeter and the change in temperature is noted. Thus, the heat of neutralization may be defined as the amount of heat given out or evolved when 1 gm equivalent of the acid is completely neutralized by 1 gm equivalent of the base in the dilute solutions.

Heat of neutralization of a strong acid or strong base is always found constant, i.e., 57.3 kJ. This is due to the fact that strong acids (HCl) and strong base (NaOH) are completely ionized in dilute solutions. Thus, the heat ...

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