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29 December, 12:37

24. The equilibrium between carbon dioxide and carbonic acid is very important in biology and environmental science. CO2 (g) + H2O (l) H2CO3 (aq) Which of the following is correct equilibrium constant expression (Kc) for this reaction? a) Kc = [H2CO3] / [CO2] [H2O] b) Kc = [CO2] [H2O] / [H2CO3] c) Kc = [H2CO3] / [CO2] d) Kc = [CO2] / [H2CO3] e) Kc = 1 / [H2CO3]

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  1. 29 December, 12:46
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    Option c) Kc = [H2CO3] / [CO2]

    Explanation:

    The producttion of carbonic acid by dissolving CO2 in water follows some series of equation.

    CO2 dissolves in water (H2O) to produce carbonic acid as shown by the following equation:

    1. The CO2 gas first dissolves in water to produce aqueous CO2 as shown below:

    CO2 (g) + H2O CO2 (aq) + H2O

    2. The aqueous CO2 dissolves in water (H2O) to produce carbonic acid as shown by the following equation:

    CO2 (aq) + H2O (l) H2CO3 (aq)

    The equilibrium constant for the above reaction is given below:

    Kc = [H2CO3] / [CO2]
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