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# Questions tagged [equilibrium]

The state in which both reactants and products are present at concentrations which have no further tendency to change with time.

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### How does pressure shift equlibrium

Here is a question from my practice problems: I know that the answer is A, but I don't know why. Is it because A has the most moles of gas on the left? thanks
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### chemical equilibrium reaction for burned gases in engine

I do not understand how equation(3) occurs.(taken from the book Internal Combustion Engines by John B.Heywood)  Consider a reactive mixture of ideal gases. The reactant species $M_a,M_b$ etc.and ...
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### How can the equilibrium shift, while Kc remains constant?

Consider the following reversible reaction. $$\ce{Cr2O7^2-(aq) + H2O(l) <=> 2 CrO4^2-(aq) + 2 H+(aq)}$$ What will happen to the position of equilibrium and the value of $K_c$ when more ...
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### The reasoning behind predominance diagrams

Consider a one dimensional predominance diagram for a simple acid-base reaction: $$\ce{AH <=> A^- + H^+}$$ With equilibrium constant: $$K_a = \frac{[A^-]_{eq}[H^+]_{eq}}{[AH]_{eq}}$$ If I ...