AP Chemistry : Solutions

Study concepts, example questions & explanations for AP Chemistry

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Example Questions

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Example Question #11 : Solubility

Which of the following will form a precipitate in solution?

Possible Answers:

None of these will form a precipitate

Correct answer:

None of these will form a precipitate

Explanation:

Standard solubility rules tell us that group I elements and ammonium cations will always result in soluble salts. Lithium, sodium, and potassium are all group I elements, indicating that none of the given answer options will form a precipitate in solution.

Example Question #21 : Solubility

Which of the following ionic compounds is soluble in water?

I. 

II. 

III. 

Possible Answers:

II and III

I, II, and III

I only

I and II

Correct answer:

I and II

Explanation:

Solubility rules determine which ionic compounds are soluble. All nitrates and group I compounds (those containing alkali metals) are soluble. This means that compounds I and II must be soluble; compound I is a nitrate and compound II contains sodium, an alkali metal.

Compound III, calcium fluoride, is not soluble. Most fluoride compounds are soluble, with the exceptions of: .

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