Multiple Choice
Which of the following best describes what happens when a solid is soluble in a liquid?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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According to common solubility rules, which two cations typically form insoluble halide salts (such as chlorides, bromides, and iodides)?
A
Ca^{2+} and Mg^{2+}
B
Ba^{2+} and Sr^{2+}
C
Ag^+ and Pb^{2+}
D
Na^+ and K^+
Verified step by step guidance1
Recall the common solubility rules for halide salts (chlorides, bromides, iodides): most halide salts are soluble except those formed with certain cations.
Identify the cations that typically form insoluble halide salts. According to solubility rules, halides of silver (Ag^+), lead (Pb^{2+}), and mercury (Hg_2^{2+}) are generally insoluble or sparingly soluble.
Compare the given options with these known exceptions. Ca^{2+}, Mg^{2+}, Ba^{2+}, Sr^{2+}, Na^+, and K^+ generally form soluble halide salts.
Recognize that Ag^+ and Pb^{2+} are the cations that commonly form insoluble halide salts, making them the correct choice.
Summarize that the solubility exceptions for halides are mainly due to the presence of Ag^+ and Pb^{2+}, which cause precipitation in solution.
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