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Some students investigated the energy changes occurring in the reaction between
potassium hydrogencarbonate and hydrochloric acid.
The equation for the reaction is:
KHCO,(s) + HCl(aq) KCl(aq) + CO.(g) + H₂O(l)
This is the method used.
1. Measure 50 cm hydrochloric acid into a glass beaker.
2. Measure the temperature of the hydrochloric acid.
3. Measure a given mass of potassium hydrogencarbonate.
4. Add the potassium hydrogencarbonate to the hydrochloric acid.
5. Stir until all the potassium hydrogencarbonate has reacted.
6. Record the lowest temperature reached.
7. Repeat three more times, using the same mass of potassium hydrogencarbonate.
Each student used a different mass of potassium hydrogencarbonate.
(a) The method described will not give very accurate results.
Suggest one change to the apparatus that would improve the accuracy of the
results.
Give a reason for your answer.

Sagot :

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