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High School Chemistry : Help with Equilibrium Constant

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Example Questions

Example Question #14 : Chemical Equilibrium

If the equilibrium constant lies farther to the right, this indicates that the reaction __________.

Possible Answers:

is more complete

is less complete

does not have a bearing on the reaction

includes a catalyst

Correct answer:

is more complete

Explanation:

The equilibrium constant is given by the concentraton of products over the concentration of reactants. If it lies to the right, it means that it favors the forward reaction, and thus the reaction is "more complete" or closer to completion.

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Example Question #11 : Solubility

Consider the following balanced equation for the solubility of barium hydroxide in an aqueous solution.

$Ba(OH)_{2}_{(s)} \rightleftharpoons Ba^{2+}_{(aq)} + 2OH^{-}_{(aq)}$

$\small K_{sp} = 5*10^{-3}$

What is the equilibrium expression for the balanced reaction?

Possible Answers:

$\small K_{sp} = [Ba^{2+}][OH^{-}]^{2}$

$\small K_{sp} = [Ba^{2+}][OH^{-}]$

$\small K_{sp} = \frac{[Ba^{2+}][OH^{-}]^{2}}{[Ba(OH)_{2}]}$

$\small K_{sp} = 2[Ba^{2+}][OH^{-}]$

Correct answer:

$\small K_{sp} = [Ba^{2+}][OH^{-}]^{2}$

Explanation:

When writing the equilibrium expression for an insoluble salt, remember that pure solids and liquids are not included in the expression. Also, the coefficients for the compounds in the balanced reaction become the exponents for the compounds in the equilibrium expression.

Given a generalized chemical reaction, we can determine the equilibrium constant expression.

$aA+bB\rightleftharpoons cC+dD$

$K_{eq}=\frac{[C]^c[D]^d}{[A]^a[B]^b}$

In our reaction, the reactant is a pure solid and is not included in the equilibrium calculation.

$\small Ba(OH)_{2}_{(s)} \rightleftharpoons Ba^{2+}_{(aq)} + 2OH^{-}_{(aq)}$

$K_{sp}=[Ba^{2+}][OH^-]^2$

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Example Question #11 : Equilibrium

Which of the following factors will change the equilibrium constant, K_eq?

Possible Answers:

Change in temperature

Introducing additional products

Change in solvent volume

Introducing additional reactants

Correct answer:

Change in temperature

Explanation:

The only factor that changes the equilibrium constant is temperature. Changes in concentration of reactants or products by any means (whether addition, taking away solvent, or adding a chemical that will cause side reactions) will remove the system from equilibrium, but will not change the equilibrium constant.

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Example Question #11 : Equilibrium

Which of the following factors will change the equilibrium constant, K_eq?

Possible Answers:

Introducing additional products

Change in temperature

Introducing additional reactants

Change in solvent volume

Correct answer:

Change in temperature

Explanation:

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High School Chemistry : Help with Equilibrium Constant

Study concepts, example questions & explanations for High School Chemistry

All High School Chemistry Resources

Example Questions

Example Question #14 : Chemical Equilibrium

Example Question #11 : Solubility

Example Question #11 : Equilibrium

Example Question #11 : Equilibrium

All High School Chemistry Resources

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