1 AP Chemistry Lab Brockport High School NY USA Heat of Neutralization, ∆ H Mr Keefer Introduction Most chemical reactions are accompanied by a chance in energy, usually in the form of heat. The energy change of a reaction is called the heat of reaction or enthalpy . The symbol, ∆ H, is used to denote the enthalpy change. A chemical change that has heat given off during the reaction is said to be exothermic and ∆ H is negative (<0); if heat is absorbed, the reaction is endothermic and ∆ H is positive (>0). In this experiment you will measure the heat of neutralization when an acid and a base react to form water. The quantity of heat given off during the exothermic reaction will be estimated using a thermally insulated vessel called a calorimeter. The temperature change of the calorimeter and its contents is measured before and after the reaction. The change in enthalpy, ∆ H, is equal to the negative product of the temperature change, ∆ T, times the heat capacity (C) of the calorimeter and its contents. Materials
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