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Chemistry

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how can i know if a solution is aqueous or solid? i have a test tomorrow and don't know how to do this PLEASE HELP!!! i have this question on my homework...Will precipitation occur when the following solutions are mixed?
1. Na2Co3 and AgNO3
2. NaNO3 and NiSO4
3. FeSO4 and Pb(NO3)2

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