1.1. A laboratory technician discovered four poorly labelled bottles each containing a solution of a different Group 2 metal compound. All four bottles had a white solid around the stopper and neck.

Describe a series of chemical tests the technician could perform to identify the compound in each of the four bottles. Include all essential reagents and the expected observations.

1.2. The compound containing barium did not dissolve when sulfuric acid, hydrochlorc acid or water was added. Explain why.   

1.3. The technician finds a fifth bottle, which she confidently identifies as calcium hydroxide and it is labelled as a saturated solution. 

Explain how the technician could determine if this solution is a fully saturated calcium hydroxide solution.