5. Three investigation I, II and III, were carried out for the reaction between calcium carbonate
powder and excess hydrochloric acid of different concentrations. The results of the investigations
are shown
a. Which investigation used hydrochloric acid of the lowest concentration?
b. What do you notice about the speed of reaction for all three investigations as the reaction
proceeded? Explain your observations.
C. What can you infer from Graph Ill?
Answers: 3
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