Multiple Choice
Which statement best describes how temperature affects the solubility of most solid ionic compounds in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
Multiple Choice
When copper(II) sulfate (CuSO_4) is dissolved in water, what can be said about its solubility according to common solubility rules?
A
CuSO_4 is insoluble in water because copper(II) compounds are generally insoluble.
B
CuSO_4 is only slightly soluble in water due to the presence of the sulfate ion.
C
CuSO_4 is soluble in water because all sulfates are soluble except those of Ba^{2+}, Pb^{2+}, and Ca^{2+}.
D
CuSO_4 forms a precipitate in water because all sulfate salts are insoluble.
Verified step by step guidance1
Recall the common solubility rules for ionic compounds in water, which help predict whether a compound will dissolve or form a precipitate.
According to the solubility rules, most sulfate salts (SO_4^{2-}) are soluble in water, with notable exceptions including barium sulfate (BaSO_4), lead(II) sulfate (PbSO_4), and calcium sulfate (CaSO_4), which are only slightly soluble or insoluble.
Copper(II) sulfate (CuSO_4) contains the sulfate ion, and copper(II) is not one of the exceptions listed in the solubility rules for sulfates.
Therefore, based on these rules, CuSO_4 is expected to be soluble in water because it does not fall under the exceptions for sulfate salts.
Summarize that the solubility of CuSO_4 in water is consistent with the general rule that sulfates are soluble except for those of Ba^{2+}, Pb^{2+}, and Ca^{2+}.
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