Concerning the reactions described in Exercise 75(b), 

(a) Will the same observations be made if Ca(OH)₂(aq) is replaced by CaCl₂(aq)? Explain.

(b) Show that the white precipitate will redissolve if the Ca(OH)₂(aq) is about 0.005 M, but not if the solution is saturated.

Exercise 75(b)

Write net ionic equations for each of the following observations.

(b) When a piece of dry ice, CO₂(s), is placed in a clear dilute solution of limewater [Ca(OH)₂(aq)], bubbles of gas evolve. At first, a white precipitate forms, but then it redissolves.