2. Which of the following compounds would form a precipitate? a. KNO3 b. CaCO3 c. KI d. Sr(OH)2

To determine which compound would form a precipitate, we need to consider the solubility rules for ionic compounds in water.a. (potassium nitrate) is soluble in water, so it would not form a precipitate.b. (calcium carbonate) is insoluble in water, so it would form a precipitate.c. KI (potassium iodide) is soluble in water, so it would not form a precipitate.d. (strontium hydroxide) is soluble in water, so it would not form a precipitate.Therefore, the correct answer is b. .