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    manzoorvbc's Avatar
    manzoorvbc Posts: 2, Reputation: 1
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    #1

    Aug 12, 2010, 10:56 PM
    I want to calculate 50 ppm from available chemical CuSo4 in the market, how can I
    I have to add 50 ppm in a certain test reagent and have laboratory grade CuSo4 (hydated) with me. How much CuSo4 I have to take which will contain 50 ppm of Copper. Pl teach me the basics of the calculation so that I can use the same principle in other calculations (for other materials) also. Thanks
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Aug 14, 2010, 11:24 AM
    You first need to know what mass of the salt is copper.

    Relative mass of copper = 63.5
    Relative mass of copper sulfate pentahydrate = 63.5 + 32 + 64 + (18 x 5) = 249.5

    % Mass of copper = (63.5 / 249.5) x 100% = 25.45 %

    50 ppm is 50 mg per litre. So, you need 50 mg of copper ion in 1 litre.
    Now, you can use proportions!
    If 25.45% represent 50 mg,
    100% would be (50/25.45)x100 = 196.46 mg = 196.5 mg = 0.197 g

    So, you need 0.197 g of copper sulfate pentahydrate crystals in 1 litre of solution.
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