All AP Chemistry Resources
Example Questions
Example Question #81 : Solutions
Which of these WILL be soluble in water?
CsCl
AgCl
Ca2(PO4)3
FeCl2
CuCl
CsCl
Solubility Rules: the only soluble ionic compound listed is CsCl; the rest are insoluble due to solubility rules
Example Question #171 : Solutions And States Of Matter
Which of the following compounds is insoluble in water?
Unless paired with an alkali metal, carbonate compounds are generally insoluble. Compounds that contain nitrate or an alkali metal will generally be soluble in water, and hydroxides are soluble when paired with heavier alkaline earth metals (such as calcium).
Example Question #172 : Solutions And States Of Matter
Which of the following will form a precipitate in solution?
None of these will form a precipitate
None of these will form a precipitate
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 #172 : Solutions And States Of Matter
Which of the following ionic compounds is soluble in water?
I.
II.
III.
II and III
I only
I and II
I, II, and III
I and II
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: .