Chemistry

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The Cu2+ ion can be separated from Ag+,
Ca2+, and K+ in aqueous solution by
1. precipitation of Cu2+ as Cu(OH)2(s) with
6 M NaOH(aq).
2. precipitation of Ag+, Ca2+, and K+ as
the carbonates.
3. None of these procedures will separate
Cu2+ from the other ions.
4. precipitation of Cu2+ as CuCl2(s) with 6
M HCl(aq).
5. precipitation of Cu2+ as CuS(s) at pH 1.

  • Chemistry -

    The Cu2+ ion can be separated from Ag+,
    Ca2+, and K+ in aqueous solution by
    1. precipitation of Cu2+ as Cu(OH)2(s) with 6 M NaOH(aq).
    Cu(OH)2 will ppt but so will Ag(OH)2/Ag2O.

    2. precipitation of Ag+, Ca2+, and K+ as
    the carbonates.
    CuCO3 will ppt with Ag2CO3 and K^+ will not\
    3. None of these procedures will separateCu2+ from the other ions.
    I think this is the best answer.

    4. precipitation of Cu2+ as CuCl2(s) with 6 M HCl(aq).
    Absolutely not. CuCl2 is soluble.

    5. precipitation of Cu2+ as CuS(s) at pH 1.
    The solubility of Ag2S and CuS are more or less the same at pH=1 so that will not separate the two.

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