Multiple Choice
With which of the following ions will the ammonium ion, NH_4^+, form an insoluble salt?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Barium bromide (BaBr_2) dissolves in water. Which statement is true?
A
BaBr_2 is insoluble in water because all barium salts are insoluble.
B
BaBr_2 is soluble in water only at high temperatures.
C
BaBr_2 is insoluble in water because bromide salts are generally insoluble.
D
BaBr_2 is soluble in water because all bromide salts are soluble except those of silver, lead, and mercury(I).
Verified step by step guidance1
Recall the general solubility rules for ionic compounds in water, which help predict whether a salt will dissolve.
Note that most bromide (Br⁻) salts are soluble in water, with exceptions typically including salts of silver (Ag⁺), lead (Pb²⁺), and mercury(I) (Hg₂²⁺).
Recognize that barium (Ba²⁺) is an alkaline earth metal ion, and many of its salts are soluble, especially those with halide ions like bromide.
Apply these rules to BaBr₂: since bromide salts are generally soluble except for the exceptions mentioned, and barium is not one of those exceptions, BaBr₂ should be soluble in water.
Conclude that the correct statement is that BaBr₂ is soluble in water because all bromide salts are soluble except those of silver, lead, and mercury(I).
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