any replacement of copper sulphate with magnesium?
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When a piece of magnesium is dipped into blue copper sulfate solution: the blue colour fades as colourless magnesium sulfate solution forms. brown copper coats the surface of the magnesium.
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magnesium becomes coated with copper. the blue colour of the solution fades as the blue copper(II) sulfate solution is replaced by a colourless magnesium sulfate solution.
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