AP Chemistry : Other Solution Concepts

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

Example Question #91 : Solutions And States Of Matter

How many milliliters of solution is needed to dissolve 5 grams of  to prepare a solution of concentration 10M?

Possible Answers:

Correct answer:

Explanation:

In order to calculate the number of milliliters, we must first determine the number of moles in 5 grams of  using its molecular weight as a conversion factor:

Using the concentration units as a conversion factor and the number of moles calculated, the number of milliliters can be calculated:

Example Question #11 : Other Solution Concepts

A solution was prepared by diluting 10mL of a 0.500M salt solution to 20mL. What would be the final concentration of this solution?

Possible Answers:

Correct answer:

Explanation:

Use the dilution formula:

Rearranging this equation gives:

Plugging in the values gives:

Therefore, after diluting the solution to 20mL, the solution concentration would be lowered from 0.50M to 0.25M.

Example Question #51 : Solutions

Which of the following is a weak electrolyte?

Possible Answers:

Correct answer:

Explanation:

Solutes that dissociate completely in a solution are called strong electrolytes. Weak electrolytes stay paired to some extent in solutions. As a result, strong electrolytes include ionic compounds and strong acid and bases.

Example Question #13 : Other Solution Concepts

Which of the following definitions is false?

Possible Answers:

Solubility product, , is the product of ion concentrations at equilibrium in a supersaturated solution of salt.

Ion-product constant of water, , is the product of equilibrium concentration of  and  ions in an aqueous solution at .

Molality is the number of moles of solute in a solution divided by the number of kilogram of solvent.

The van't Hoff factor, i, is the number of ions that a compound produces in a solution.

Correct answer:

Solubility product, , is the product of ion concentrations at equilibrium in a supersaturated solution of salt.

Explanation:

Solubility product, , is the product of ion concentrations at equilibrium in a saturated solution of salt. All other definitions are true.

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