I keep getting “Equilibrium constant” questions wrong in Equilibrium. What's the trap?
including pure solids/liquids in the K expression.
The usual trap: including pure solids/liquids in the K expression. How to avoid it: leave out pure solids and liquids — only gases and solutions count. Go back to the definition — K compares products to reactants at equilibrium; a large K means products are favoured.
Key point
Equilibrium constant
Common mistake
including pure solids/liquids in the K expression.
Memory tip
leave out pure solids and liquids — only gases and solutions count.
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