Question

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

Answer 1

calcium chloride and silver nitrate

Step-by-step 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.