Equilibrium Constant and Reaction Quotient

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SAT Subject Test in Chemistry › Equilibrium Constant and Reaction Quotient

Questions 1 - 1

$CO_2 _{(aq)} + H_2O _{(l)} \rightleftharpoons H_2CO_3 _{(aq)}$

What is an expression for the equilibrium constant for the above equation?

$\frac{[H_2CO_3]}{[CO_2][H_2O]}$

$\frac{[H_2CO_3]}{[CO_2]}$

$\frac{[CO_2][H_2O]}{[H_2CO_3]}$

$\frac{[H_2O]}{[H_2CO_3][CO_2]}$

$\frac{[H_2CO_3]^3}{[H_2O]^2[CO_2]^2}$

Explanation

The formula for the equilibrium constant is the product of the concentration of the products divided by the product of the concentration of the reactants. Since none of the reactants or products have coefficients, no exponents are needed in the expression. The phases do not affect the equilibrium constant in this example.

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