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Heat of Solutions


Calcium chloride (exothermic) and ammonium chloride (endothermic) are added to water. The temperature change of the solution is measured and displayed using a large digital thermometer. The demonstration can be done either qualitatively or quantitatively. Other salts can be used in place of those listed.

Chemicals and Solutions

  • Calcium chloride 10 g (record weight used)
  • Ammonium Chloride 10g (record weight used)


  • Digital display and temperature probe
  • Two 250mL beakers


Dissolve each salt in 100 mL water and show the temperature change