Separation of mixtures
2 marks · EasyA mixture of water and ethanol is heated. Water has a boiling point of 100°C and ethanol has a boiling point of 78°C. If the thermometer reads 78°C while distillate is being collected, which liquid is distilling over? Calculate how many degrees lower this temperature is than the boiling point of water.
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22 °C (±0)
Common mistakes: 78
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Marking points
M1 · 1 mark · Subtracts ethanol boiling point (78) from water boiling point (100).
A1 · 1 mark · Gives the correct answer of 22°C.
Worked solution