Question detail
In a reaction at equilibrium, the concentration of reactant A is decreased from 0.6 mol/dm3 to 0.4 mol/dm3. If the initial equilibrium constant Kc was 2.5, what will be the new position of equilibrium?
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At a glance
Question
Type
exam_style
Style
Topic
Reversible reactions and dynamic equilibrium
Question
In a reaction at equilibrium, the concentration of reactant A is decreased from 0.6 mol/dm3 to 0.4 mol/dm3. If the initial equilibrium constant Kc was 2.5, what will be the new position of equilibrium?
Answer
The equilibrium will shift to the left, towards the reactants, to restore the equilibrium constant.
Explanation
This question assesses the ability to apply Le chatelier's Principle in predictingthe shift in equilibrium position when reactant concentration changes. The answer shows understandingof how equilibrium constants relate to concentration changes. This answer is strongest when it stays anchored to The effect of changingconcentration (HT only) and directly addresses (HT only) Predict that decreasingreactant concentration shifts equilibrium towards reactants.
Common mistake
Misunderstanding Equilibrium Shift
Students often think that decreasing reactant concentration will shift the equilibrium towards products instead of reactants.
Remember that according to Le Chatelier's Principle, decreasing the concentration of reactants will shift the equilibrium towards the side that produces more reactants to oppose the change.
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