GCSE / O Levels Chemistry

A student follows the rate of the reaction between marble chips, CaCO3, and dilute
hydrochloric acid.
CaCO3 + 2HCI → CaCl, + CO2 + H20
Which diagrams show apparatus that is suitable for this experiment?
1
2
- loose
-measuring
cylinder
plug
hydrochloric.
acid
hydrochloric
marble chips-
acid
balance
-water
marble chips-
4
hydrochloric
acid
hydrochloric
acid
-burette
burette
gas syringe
marble chips -
marble chips
A 1 and 2 only
B
1 and 3
C 1 and 4 only
1, 2 and 4
3.


Choice D is correct because:

In diagram 1, hydrochloric acid and marble chips are the reactants. The measuring cylinder can be used to prevent the carbon dioxide produced from escaping while the water present can also dissolve the gas.

In diagram 2, hydrochloric acid and marble chips are the reactants. The loose plug prevents the carbon dioxide produced from escaping while the balance helps determine the amount of reactant used up in the reaction.

In diagram 4, hydrochloric acid and marble chips are the reactants, the burette can be used to measure the volume of the acid if needed, and the gas syringe is used to collect the gas produced.

Choice A is incorrect because it does not state that diagram 4 shows apparatus suitable for this experiment.

Choice B is incorrect because In diagram 3, the burette is used to measure the volume of a liquid, which is not relevant in this experiment. The experiment has to determine the volume of gas evolved, not the volume of the acid.

Choice C is incorrect because it does not state that diagram 2 shows apparatus suitable for this experiment.

Experimental Design | 2017 - O/N - 5070/12 | Q4