Multiple Choice
Based on general solubility rules, which of the following compounds is most likely to be insoluble in water?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
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Which statement about solubility is true?
A
Carbonates (CO_3^{2-}) are generally soluble in water.
B
All nitrates (NO_3^-) are soluble in water.
C
Chlorides (Cl^-) are always insoluble except for sodium chloride.
D
All sulfates (SO_4^{2-}) are insoluble in water.
Verified step by step guidance1
Recall the general solubility rules for common ionic compounds in water, which help predict whether a compound will dissolve or not.
Understand that nitrates (NO_3^-) are known to be soluble in water regardless of the cation they are paired with. This is a key solubility rule.
Recognize that carbonates (CO_3^{2-}) are generally insoluble except when paired with alkali metals (like sodium or potassium) or ammonium ions.
Know that chlorides (Cl^-) are mostly soluble, with exceptions such as silver chloride (AgCl) and lead chloride (PbCl_2), so the statement about chlorides being always insoluble except sodium chloride is incorrect.
Remember that most sulfates (SO_4^{2-}) are soluble, but there are exceptions like barium sulfate (BaSO_4) and lead sulfate (PbSO_4), so the statement that all sulfates are insoluble is false.
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