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Why does adding a catalyst not affect the concentration of products

Submitted by Anonymous (not verified) on Mon, 04/27/2009 - 08:55

Adding a catalyst to a reaction speeds up the rate of reaction. Explain why the concentration of D does not change when a catalyst is added to the reaction represented by the following general equilibrium equation: A + B D

Catalysts speed up the rate of chemical reactions. In an equilibrium, this means that the rate of the forward and back reactions are both speeded. It means that the (same) position of equilibrium will be achieved in a shorter time with the catalyst as without the catalyst. It does not allow more product to be made - only the same amount in a shorter time.
Catalysts lower the activation energy of the forward and back reactions by the same amount so that both take place more easily.

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