Inorganic Qualitative Analysis - Y13

Addition of NaOH(aq) to [Cu(H₂O)₆]²⁺ until in excess

Blue precipitate - does not dissolve in excess

Addition of NaOH(aq) to [Fe(H₂O)₆]³⁺ until in excess

Orange/brown precipitate - does not dissolve in excess

Addition of NaOH(aq) to [Fe(H₂O)₆]²⁺ until in excess

Green precipitate - does not dissolve in excess

Addition of NaOH(aq) to [Mn(H₂O)₆]²⁺ until in excess

Light brown/beige precipitate - does not dissolve in excess

Addition of NaOH(aq) to [Cr(H₂O)₆]³⁺ until in excess

Green precipitate - dissolves in excess to form a green solution

Addition of NH₃(aq) to [Cu(H₂O)₆]²⁺ until in excess

Blue precipitate - dissolves in excess to form a deep blue solution

Addition of NH₃(aq) to [Cr(H₂O)₆]³⁺ until in excess

Green precipitate - dissolves in excess to form a purple solution

Test for aqueous carbonate ions

Addition of aqueous acid produces bubbles

Test for aqueous sulfate ions

Addition of Ba²⁺(aq) produces a white precipitate

Test for aqueous chloride ions

Addition of Ag⁺(aq) produces a white precipitate which dissolves in dilute NH₃(aq)

Test for aqueous bromide ions

Addition of Ag⁺(aq) produces a cream precipitate which dissolves in concentrated NH₃(aq)

Test for aqueous iodide ions

Addition of Ag⁺(aq) produces a yellow precipitate which is insoluble in concentrated NH₃(aq)

Test for aqueous ammonium ions

Warm with NaOH(aq). Gas produced turns damp litmus paper blue