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GRE Subject Test: Chemistry : Equilibrium Constant and Reaction Quotient

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Example Questions

Example Question #1 : Equilibrium Constant And Reaction Quotient

Which of the following is true regarding the solubility product constant, $\small K_{sp}$ $\displaystyle \small K_{sp}$, for a reaction in the form:

$aA_{(s)}\rightleftharpoons cC_{(aq)}+dD_{(aq)}$ $\displaystyle aA_{(s)}\rightleftharpoons cC_{(aq)}+dD_{(aq)}$

Possible Answers:

$K_{sp}=[C]^c[D]^d$ $\displaystyle K_{sp}=[C]^c[D]^d$

$\small K_{sp}$ $\displaystyle \small K_{sp}$ represents the ratio of reactants to products as the reaction progresses

The concentration of substance $\small A$ $\displaystyle \small A$ strongly influences the value of $\small K_{sp}$ $\displaystyle \small K_{sp}$

$\small K_{sp}$ $\displaystyle \small K_{sp}$ has units of moles per liter

As more of substance $\small A$ $\displaystyle \small A$ dissolves in the given solution, $\small K_{sp}$ $\displaystyle \small K_{sp}$ increases

Correct answer:

$K_{sp}=[C]^c[D]^d$ $\displaystyle K_{sp}=[C]^c[D]^d$

Explanation:

To determine the solubility product constant, we only need the concentrations and coefficients of the ions. The effective concentration of any pure substance (solid, liquid, or gas) is equal to one by definition, so does not influence the value of $\small K_{sp}$ $\displaystyle \small K_{sp}$. The equation for the solubility product constant of this reaction is:

$K_{sp}=[C]^c[D]^d$ $\displaystyle K_{sp}=[C]^c[D]^d$

The units of the solubility product constant will depend on the coefficients of the products. $\small K_{sp}$ $\displaystyle \small K_{sp}$ will be a constant for the reaction, and will not change as more solid dissolves or as the reaction progresses.

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GRE Subject Test: Chemistry : Equilibrium Constant and Reaction Quotient

Study concepts, example questions & explanations for GRE Subject Test: Chemistry

All GRE Subject Test: Chemistry Resources

Example Questions

Example Question #1 : Equilibrium Constant And Reaction Quotient

All GRE Subject Test: Chemistry Resources

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