### An original concentration after equilibrium is reestablished

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Consider an equilibrium mixture of four chemicals (A, B, C, and D) reacting in a closed flask according to the equation:
A + B <--> C + D

a) You add more A to the flask. How does the concentration of each chemical compare to its original concentration after equilibrium is reestablished?

b) You have the original set-up at equilibrium, and add more D to the flask. How does the concentration of each chemical compared to its original concentration after equilibrium is re-established?

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