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    my coursework title is: What is the best method to determine the amount of copper in a 2 pence coin? For this I will use: Gravimetry, Redox Titration and Colorimetry. For the Gravimetry, i have written that I will react the copper(II)sulphate with the zinc powder until it displaces it (colorless) and will then add sulphuric acid to react with any remaining zinc. I was just wondering once you have drained off the zinc sulphate what method would you use to dry until constant mass? Could i use a crucible?
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    Best method for gravimetric determination of copper is based on precipitation of CuSCN (yes, it is a Cu(I) compound):

    2Cu2+ + 2SCN- + SO32- + H2O -> 2CuSCN + SO42- + 2H+
 
 
 
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