Measuring enthalpy changes of reactions
3 marks · EasyA student investigates the enthalpy change when sodium hydroxide solution reacts with hydrochloric acid in a polystyrene cup.
State one reason why a polystyrene cup is used in this experiment.
Write the name of one measurement (other than temperature) the student must take to calculate the enthalpy change.
State the name of the reaction between sodium hydroxide and hydrochloric acid.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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(a) To reduce heat loss (to surroundings)
(b) Mass or volume of one of the solutions
(c) Neutralisation
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Explains polystyrene cup is used to reduce heat loss OR provide insulation.
B1 (b) · 1 mark · States mass or volume of solution as a required measurement.
B1 (c) · 1 mark · Gives 'neutralisation' as the reaction name.
Worked solution
a) A polystyrene cup is used to reduce heat loss to the surroundings.
b) The volume (or mass) of one of the solutions must be measured.
c) The reaction is called neutralisation.