Answer to Question #4751 in Inorganic Chemistry for Haley
Ni(NO3)2 + CuSO4 -> Ni(NO3)2 + CuSO4
CuSO4 is still CuSO4, Ni(NO3)2 is still Ni(NO3)2. There is no reaction between soluble salts possible if there is no gas or solid as a product.
But when it comes to another case for instance Copper(II) sulfate - CuSO4 (gives a bright blue solution) and Nickel(II) carbonate – NiCO3 (gives a green solution). The mix of solutions gives another color and this is the result of chemical change, because insoluble CuCO3 is formed.
CuSO4 + NiCO3 -> NiSO4 + CuCO3↓
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