Chapter 21, Problem 56IAE

The following series of observations is made: (1) a small piece of dry ice $\left[{\text{CO}}_{\text{2}}\left(\text{s}\right)\right]$ is added to 0.005 M $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(\text{aq}\right).$ (2) Initially, a white precipitate forms. (3) After a short time the precipitate dissolves.

1. Write chemical equations to explain these observations.
2. If the 0.005 M $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(\text{aq}\right)$ is replaced by 0.005 M ${\text{CaCl}}_{\text{2}}\left(\text{aq}\right),$ would a precipitate form? Explain.
3. If the 0.005 M $\text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(\text{aq}\right)$ is replaced by 0.010 M ${\text{Ca(OH)}}_{\text{2}}\left(\text{aq}\right)$, a precipitate forms but does not re-dissolve. Explain why.