Which of the following compounds is not soluble in HNO3___?
Correct answer: D. AgCl
- A. CuS
- B. CdS
- C. PbS
- D. AgCl
Explanation
AgCl is insoluble in nitric acid because its ionic lattice is not sufficiently broken by HNO3, whereas sulfides such as CdS and PbS dissolve in acid through formation of H2S and soluble metal ions. A student may choose CuS by assuming all sulfides are insoluble in acids, but CuS can dissolve in oxidising nitric acid, especially when concentrated or heated.
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About Solubility Product
The solubility product constant, Ksp, represents the equilibrium concentrations of ions from a sparingly soluble salt, each raised to its stoichiometric power. Problems involve writing Ksp expressions, calculating molar solubility, applying the common-ion effect and predicting precipitation from the ionic product.
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