Which of the following pairs of compounds will react to form a precipitate? Why? calcium chloride and silver nitrate
sodium iodide and potassium chloride
calcium chloride and sodium nitrate

calcium chloride and silver nitrate

Explanation:

A precipitate is often formed in a double replacement reaction when the reaction yields an insoluble product.

Consider the reaction between calcium chloride and silver nitrate;

CaCl2(aq) + 2AgNO3(aq) >2AgCl(s) + Ca(NO3)2(aq)

AgCl is insoluble in water, hence the reaction leads to the formation of a precipitate.

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