Consider this system in a fixed volume at constant temperature - HSC - SSCE Chemistry - Question 11 - 2021 - Paper 1
Question 11
Consider this system in a fixed volume at constant temperature.
$$\text{PCl}_3(s) \rightleftharpoons \text{PCl}_5(l) + \text{Cl}_2(g)$$
This system is initially at... show full transcript
Worked Solution & Example Answer:Consider this system in a fixed volume at constant temperature - HSC - SSCE Chemistry - Question 11 - 2021 - Paper 1
Step 1
A. The amount of Cl₂ will increase.
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Answer
This statement is incorrect because the addition of solid PCl₃ does not affect the equilibrium position in terms of the gaseous or liquid phases.
Step 2
B. The amount of PCl₃ will decrease.
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Answer
This statement is not true since the solid phase (PCl₃) does not participate in the equilibrium shift in the same way gases or liquids do. Its addition will not lead to a decrease in its own amount.
Step 3
C. The amount of Cl₂ will not change.
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Answer
This is the correct statement. The addition of solid PCl₃ does not alter the concentration of Cl₂ since the equilibrium concentration of solid does not affect the gases or solutions.
Step 4
D. The amount of PCl₃ will increase then decrease.
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Answer
This statement is incorrect. The amount of solid PCl₃ remains constant in an equilibrium situation; therefore, it will not show fluctuations in quantity.
