Write predictions for what you would observe if you used solution colour and precipitation reactions tests to identify the metal ion in the following unknown solution.
1. Contains Na+(aq) only
2. Contains Cu2+(aq) only
3. Contains Na+(aq) and Ag+(aq)
4. Contains Cu2+(aq) and Ag+(aq)
You could look all of this up on Google but here goes. I'll refer to google anyway in spots.
1. Sodium solutions are colorless. Almost all Na salts are soluble. There are a few that are not. See https://chemistry.stackexchange.com/questions/82328/are-there-any-sodium-salts-that-are-insoluble-in-water
2. Copper salts give a blue, green to blue green color. Pptn with H2S gives black CuS but there are many other tests for Cu^2+. You can find them on Google.
3.Almost certain to be colorless. Addition of dilute HCl gives a white ppt of AgCl which is soluble in aqueous NH3.
4.If I had a solution suspected of Cu^2+ and Ag^+, I would add dilute HCl to ppt the AgCl as a white ppt what dissolves in dilute NH3. When the NH3 is added the Cu 2+ ion will turn blue. However, the solution would be blue or blue green and you would suspect Cu anyway.