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A beaker contains a saturated solution of copper(l) chloride. Copper(l) chloride is slightly soluble salt with a solubility product of \( 1.2 \times 10^{-6} \) Which of the following salts when added to the solution would precipitate copper(l) chloride?

1. Sodium chloride
2. Potassium bromide
3. Silver(I) nitrate
4. Lead(II) acetate E. Magnesium iodide

Correct answer: Silver(I) nitrate

Solution

Silver(I) nitrate provides Ag+ ions, which react with Cl− to form AgCl, an insoluble precipitate. Removing chloride from solution shifts the equilibrium for CuCl(s) formation, causing more copper(I) chloride to precipitate.

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