First the alcohol burner was massed, followed by the calorimeter (as well as its lid).
Next about 100 ml of water was added to the calorimeter and the calorimeter and the water were massed together (to determine the mass of the water).
The apparatus was set up as shown in the diagram on the left.
The temperature of the water was taken to the nearest half a degree.
The alcohol burner was then ignited and the temperature of the water was allowed to rise about 40°C before the burner was put out. The highest temperature obtained by the water was recorded.
The alcohol burner was massed again to determine how much alcohol had been consumed.
Assuming that the heat lost by the ethanol fuel equaled the heat gained by the water and the calorimeter, the heat of combustion of ethanol was determined.
Observations: The ethanol burnt with an orange-yellow flame, showing that incomplete combustion was taking
place. The temperature rose rapidly, increasing from an initial temperature of 22°C to a maximum of 65°C. The mass of the alcohol burner decreased during the combustion as alcohol was burnt up. The alcohol burner was originally 275.61 g. After burning it was massed as 273.63 g.
Calculations: The following table contains the measurements taken during this experiment.