State how a student could carry out a chemical test to identify the Group 1 metal ion present in potassium tetrachloroaluminate, and give the result of this test.

Identify one modern instrumental technique that can both confirm the identity of this Group 1 metal ion and determine its concentration in an aqueous sample of potassium tetrachloroaluminate.

To investigate the other metal ion in potassium tetrachloroaluminate, a student adds a few drops of sodium hydroxide solution to an aqueous sample of the compound until a change is observed. State the observation made at this stage.

Since multiple metal cations yield the identical visual result in part (c), further testing is required to uniquely identify the other metal ion. Describe the additional step the student should perform and the expected observation that confirms the identity of this specific metal ion.

Describe a chemical test that the student could use to confirm the presence of chloride ions in a solution of potassium tetrachloroaluminate. Your description must include any necessary reagents and the final observation.