Chemistry / Unit 10 Chem 1766 short lesson, about 20 seconds
K's Magnitude Read Qualitatively
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The idea
A very large K means a reaction favors products heavily at equilibrium; a very small K means it favors reactants heavily; neither implies the reaction is fast.
In practice
K = 10¹⁵ predicts an equilibrium mixture that is essentially all product, however slowly it gets there.
Where people slip
A large K describes equilibrium position, not reaction speed — that is Unit 9's separate question.
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