You have a solution that contains both Al(NO3)3 and Ni(NO3)2. Al3+(aq) is colorless while Ni2+(aq) is a light green/blue. You start adding NH3 dropwise to this solution and you see first a white precipitate form. After a few more drops you start seeing a light green/blue precipitate form. What are the formulas of these precipitates and how did they form (what has adding NH3 got to do with their formation)? As you add more NH3, you start to see the light green/blue solid dissolve and the solution turns to a dark blue color. Nothing happens to the white precipitate. Provide an explanation for what might be occurring. Could you use what you just learned to separate a mixture and Al(NO3)3 and Ni(NO3)2? Describe what would you do to separate the two from each other?
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