conc. h2so4 is added to blue vitriol ?
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Copper(II) oxide, a black solid, and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution. From this solution, blue copper(II) sulfate pentahydrate crystals can be obtained.
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when concentrated sulphuric acid is added to blue vitriol the blue colour changes to White
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