sodium sulfate and barium nitrate
Adding colorless sodium sulfate to colorless barium nitrate produces a white precipitate.
Solution A: 0.2 M sodium sulfate (colorless)
Solution B: 0.1 M barium nitrate (colorless)
Precipitate: (white)
Ba(NO3)2(aq) + Na2SO4(aq) --> BaSO4(s) + 2 NaNO3(aq)
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