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The following procedure was used to investigate the temperature changes that occur when sodium hydroxide solution is added to dilute hydrochloric acid.
(i) Place the acid in a glass beaker and record its temperature.
(ii) Add a known volume of sodium hydroxide solution.
(iii) Stir the mixture and record the highest temperature reached.
(iv) Repeat steps (ii) and
(iii) with different volumes of sodium hydroxide solution.
(a) State two factors that must be kept constant in this experiment.
(b) Explain how the use of a polystyrene cup will affect the results.