Exothermic reaction of calcium oxide 1


To see how the mass of calcium oxide affects the temperature change produced in a reaction with water


Adding Calcium Oxide to water produces an exothermic reaction as aqueous Calcium Hydroxide is formed. The total energy released will increase as more bonds are broken by using a greater mass of Calcium Hydroxide


CaO powder
De-ionised water
50 ml measuring cylinder
Insulating beaker
Balance (.01g resolution)
Temperature probe and data logger
Stirring rod


In an insulating beaker combine 50ml of water with 1g of CaO
Stir and record the maximum temperature reached using a temperature probe and datalogger
Repeat the experiment by using fresh water and increasing the mass of CaO used by 1g


As CaO will react exothermically with water care should be taken to avoid contact with skin where reaction with moisture could cause irritation and in extreme cases burns.