Based on the solubility rules, which one of these compounds is soluble in water? A) CaSO₄ B) BaSO₄ C) PbSO₄ D) K₂SO₄ E) Ag₂SO₄

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According to the solubility rules, compounds containing the alkali metal ions (such as K+) are generally soluble in water. Therefore, the only compound that fits this description is D: K₂SO₄. The other compounds contain ions (such as Ca2+, Ba2+, Pb2+, Ag+) that are typically insoluble in water.

Based on the Solubility Rules, Which One of These Compounds