A laboratory technician is tasked with preparing several aqueous solutions. Based on general solubility rules, which of the following ionic compounds is expected to be insoluble in water?
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The answer
Correct answer: B. Lead(II) sulfate, because lead(II) is a common exception to the general solubility of sulfates.
Tested concept: Solubility rules
Explanation
The correct answer is Lead(II) sulfate. According to general solubility rules, most sulfates are soluble, but lead(II) (Pb²⁺) is a notable exception, forming an insoluble precipitate. Sodium chloride (NaCl) is soluble because all alkali metal compounds and all chlorides (except Ag⁺, Pb²⁺, Hg₂²⁺) are soluble. Magnesium nitrate (Mg(NO₃)₂) is soluble because all nitrates are soluble. Potassium carbonate (K₂CO₃) is soluble because all alkali metal carbonates are soluble, even though most other carbonates are insoluble.
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