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SalicylaldoximeC7H7NO2 Salicylaldoxime (reducing reagent)and its use in finding the amount of Copper in the presence of Nickel This molecule is used chiefly for the determination of copper as Cu(C7H6O2N )2 and is a greenish yellow precipitate this happens in the presence of acetic acid and at the pH of 2.6. Other metals can be unaffected by this reagent however nickel begins to precipitate off at around 3.3 pH and is the reason this method can be used for the determination of copper in the presence of nickel. As the method needs accurate pHs to be reached in order to allow proper precipitation of the metals to occur a pH probe was used to make sure the pHs were right for the precipitate. Both metals precipitate off as Ni or Cu(C7H6O2N )2 and were both filtered off using a weighed porcelain filtering crucible. The use of the weighed filtering crucible allowed for more accurate results to be taken. The Ni(C7H6O2N )2 is best formed in a neutral or slightly acidic pH and the contamination of ferric iron can interfere badly with the reaction and so steps should be taken to make sure it is absent from mixture.
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