[birdman11]

The following compounds will be in solution in test tubes, and I have to be able to identify each one based on how they react with each other and any precipitates that form:

1) potassium chromate
2) aluminum chloride
3) sodium carbonate
4) hydrochloric acid
5) sodium hydroxide
6) silver nitrate
7) ammonia
8) lead (ii) nitrate
9) ferric nitrate
10) sodium acetate
11) copper (ii) sulfate
12) nickel chloride

I know that (1) is yellow/orange by looking at it, (11) is blue, and (12) is green. I also know that (1) and (6) form a red precipitate.

How can I go about finding out what the others are?

[Borek]

You are on the right track. Think what other precipitates can form when you mix these solutions, perhaps some color changes may happen?

[Arkcon]

So you're allowed to use your eyes, as a detection mechanism?  Good.  Now, can you use another innate human sense (carefully,) to distinguish some compounds from another?  Some should be so obvious they aren't even worth mentioning in the list?  How much have you narrowed it down on your own so far?