In the reaction between KNO3 and AgCl, which product forms a precipitate?

• A. AgCl
• B. No precipitate formed
• C. KNO3
• D. AgK

Answer: (A)

Verified step by step guidance

1. Identify the reactants and possible products in the reaction between KNO3 and AgCl. Since KNO3 is a soluble salt and AgCl is a sparingly soluble salt, consider the ions involved: K\^{+}, NO_3\^{−}, Ag\^{+}, and Cl\^{−}.
2. Write the possible double displacement reaction where the cations and anions exchange partners: KNO_3 + AgCl \rightarrow KCl + AgNO_3.
3. Determine the solubility of the products KCl and AgNO_3 using solubility rules. Both KCl and AgNO_3 are generally soluble in water, so they remain dissolved.
4. Recall that AgCl is known to be poorly soluble in water and forms a solid precipitate under normal conditions, while KNO_3 is soluble and remains in solution.
5. Conclude that in the reaction mixture, AgCl is the compound that forms a precipitate, while KNO_3 remains dissolved, so the precipitate is AgCl.