Sodium hydroxide - This is soluble in water and used to test for cations, Copper(II) ions - Shown by the formation of a blue precipitate when added to NaOH solution, Iron(III) ions - Shown by the formation of an orange-brown precipitate when added to NaOH solution, Iron(II) ions - Shown by the formation of a green precipitate when added to NaOH solution, Cations - Positive ions , Carbonate ion test - Add to HCl and bubble gas through limewater, Sulfate ion test - Add to nitric acid and follow with barium chloride solution, Halide test - Add to HNO3 and follow with silver nitrate solution, Carbon dioxide gas - Turns limewater milky, BaSO4 - Forms a white precipitate and confirms the presence of sulfate ions, AgCl - Forms a white precipitate , AgBr - Forms a cream precipitate, AgI - Forms a yellow precipitate, Anion - Negative ions,

Anion tests

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