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To study the enthalpy changes (ÄH) of various acid-base neutralization.
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Experiment 1- Heat of Neutralization Title: Heat of Neutralization Objective: To study the enthalpy changes (?H) of various acid-base neutralization. Introduction: Neutralization is the reaction between an acid and a base, and is an exothermic reaction. The enthalpy of neutralization is the heat produced when an acid and a base react together in dilute aqueous solution to produce one mole of water. Strong acids and strong alkalis are completely dissociated in dilute solution, so the reaction between any strong acid and strong alkali may be represented as following: H+(aq) + OH-(aq)--> H2O(l) ?HO = -57.3 kJ mol-1 If a weak acid or alkali is used, or if both are weak, then the enthalpy of neutralization is usually lower than -57.3 kJ mol-1 This is because weak acids and weak alkalis are only slightly ionized in aqueous solution, and energy is absorbed in ionizing the un-ionized molecules. CH3COOH(aq) + NH3(aq)-->CH3COONH4(aq) ?HO = -32.0 kJ mol- The...
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