According to Solubility Rule #2, which compound is insoluble in water?

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Multiple Choice

According to Solubility Rule #2, which compound is insoluble in water?

Explanation:
Solubility rules in water show that nitrates and ammonium salts are generally soluble, while many sulfides are insoluble unless paired with very specific cations. Lead(II) sulfide fits the insoluble category because sulfides are not soluble in water except when combined with alkali metals, ammonium, or some alkaline earth metals. Lead(II) is not one of those soluble-exception cations, so PbS remains a solid in water. The other options dissolve easily: nitrates (sodium nitrate and potassium nitrate) are soluble, and ammonium carbonate dissolves because ammonium salts are typically water-soluble.

Solubility rules in water show that nitrates and ammonium salts are generally soluble, while many sulfides are insoluble unless paired with very specific cations. Lead(II) sulfide fits the insoluble category because sulfides are not soluble in water except when combined with alkali metals, ammonium, or some alkaline earth metals. Lead(II) is not one of those soluble-exception cations, so PbS remains a solid in water. The other options dissolve easily: nitrates (sodium nitrate and potassium nitrate) are soluble, and ammonium carbonate dissolves because ammonium salts are typically water-soluble.

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