The Equilibrium Constant

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5 Terms

1
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What is the equilibrium constant?

The equilibrium constant, Kc is a ratio worked out from the concentrations of the products and reactants after equilibrium is reaches. It is essentially how far right the equilibrium is positioned

2
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How do you write an expression for Kc?

  • The lower case letters, a, b, c, d are the number of moles of each substance in the equation.

  • The square brackets, [ ], mean the concentration in mol/dm³

  • Products on top, reactants on the bottom

<ul><li><p>The lower case letters, a, b, c, d are the number of <strong>moles</strong> of each substance in the equation.</p></li><li><p>The square brackets, [ ], mean the <strong>concentration </strong>in mol/dm³ </p></li><li><p>Products on top, reactants on the bottom</p></li></ul><p></p>
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How does changing the temperature affect the value of Kc?

  • If the change means more product is formed, Kc will rise

  • If the change means less product is formed, then Kc will decrease

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What is the effect of changing the concentration on the value of Kc?

  • Kc is fixed at a given temperature

  • If the concentration of one thing in the equilibrium mixture changes, Kc stays the same but the concentrations of the others change in order to keep Kc the same

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What is the effect of adding a catalyst on the value of Kc?

  • Catalysts have no effect of the position of equilibrium or on the value of Kc.

  • This is because a catalyst will increase the rate of both the forward and backward reactions by the same amount.