Based on your knowledge of the solubility rules for ionic compounds in water, which salt is soluble in water?

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BlackTom AI · Accepted Answer

When evaluating solubility of ionic compounds in water, it helps to apply common rules and patterns. 
Option 1: BaSO4. Barium sulfate is a sulfate that is famously insoluble in water despite many sulfates being soluble; this is a classic exception explained by strong lattice energy and limited hydration. So this compound tends not to dissolve readily. 
Option 2: CaCO3. Calcium carbonate is another well-known insoluble salt. Carbonates generally are insoluble except when paired with ammonium or alkali metals, and CaCO3 follows that trend by remaining largely in solid form in water. 
Option 3: Mg(OH)2. Magnesium hydroxide is sparingly soluble in water; hydroxides of many metals are insoluble unless the metal is part of an alkali metal or ammonium, so Mg(OH)2 does not dissolve well. 
Option 4: (NH4)3PO4. Ammonium phosphate contains the ammonium ion, and ammonium salts are typically soluble in water due to favorable hydration and lattice considerations; this compound is expected to dissolve. 
In summary, the first three options align with common insolubility trends for BaSO4, CaCO3, and Mg(OH)2, while the ammonium salt in the fourth option follows the well-established rule that ammonium salts are soluble in water.

Chem 1C General Chemis... Self Assessment Quiz 18

Based on your knowledge of the solubility rules for ionic compounds in water, which salt is soluble in water?

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