The effect of concentration
2 marks · EasyThe reaction below is at equilibrium:
At equilibrium, [Q] is 3.0 mol/dm^3 and [P] is 1.0 mol/dm^3. If 0.5 mol/dm^3 of Q is removed, what will [Q] be after the change is compensated and equilibrium is restored? Assume the system restores [Q] to the original value.
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3.0 mol/dm^3 (±0.1)
Common mistakes: Gives 2.5 mol/dm^3 as final answer
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Marking points
M1 · 1 mark · Recognises that the system produces more Q to restore the original [Q].
A1 · 1 mark · Correctly gives [Q] after equilibrium as 3.0 mol/dm^3.
Worked solution
Original [Q] = 3.0 mol/dm³. After removal, [Q] = 2.5 mol/dm³. System reacts to produce 0.5 mol/dm³ Q, restoring [Q] to 3.0 mol/dm³.