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This test is for the testing of the different metal ion by using of oxidizing and reducing flame. Actually borax is Na2B4O7. 10 H20. Initially it is heated for this test and the borax goes to the following change Na2B4O7. 10 H20--------) NaBO2(Sodium metaborate) + B2O3(Boric anhydride) Now this boric anhydride reacted with different metal salt and formed different colour and by this way we can characterized the different metal ions. Cr2(SO4)3 + B2O3 ------) Cr(BO2)3. (Green) CuSO4 + B2O3 ----) Cu(BO2)3 . (Blue).

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