標題:
Enthalpy change of neutralization of HCl (aq) less???
發問:
Why is it that when hydrochloric acid is neutralised, the experimental enthalpy change of neutralization is usually less negative than -57.6kJ mol-1? In another word, what is absorbing the heat?
最佳解答:
Actually this error is not only due to the absorption of heat from other things. There are some errors when carrying out this experiment and during your calculation, for example, 1. There is heat loss to the surrounding 2. The heat capacity of vacuum flask or expanded polystyrene cup is neglected 3. Specific heat capacity of the product solution is assumed to be the same as that of water 4. Thermometer used in laboratory is not precise eough And therefore, the experimental enthalpy change of neutralization is usually less negative than -57.6kJ/mol
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