Jacky 發問於 科學及數學化學 · 1 十年前

NH3(aq)+the following chemicals 會出咩色precipitate和咩色solution?

NH3(aq)+the following chemicals 會出咩色precipitate和咩色solution(在NH3 in excess or 不 in excess 的情況)?

Ag +?

Ba 2+?

Ca 2+ ?

Cr 3+ ?

Cu 2+ ?

Fe 2+ ?

Fe 3+ ?

K + ?

Mg 2+ ?

Mn 2+ ?

Na + ?

NH4 + ?

Ni 2+ ?

Pb 2+ ?

Sn 2+ ?

Zn 2+ ?

2 個解答

評分
  • 1 十年前
    最愛解答

    NH3+Ag : colourless

    NH3+Ba : colourless

    NH3+Ca : colourless

    NH3+Cr : green

    NH3+Cu : blue (or green)

    NH3+Fe(II) : pale green

    NH3+Fe(III) : yellow / brown

    NH3+K : colourless

    NH3+Mg : colourless

    NH3+Mn(II) : very pale pink

    NH3+Na : colourless

    NH3+NH4 : colourless

    NH3+Ni(II): green

    NH3+Pb : colourless

    NH3+Sn : colourless

    NH3+Zn : colourless

    2007-10-13 21:44:02 補充:

    Cr, Cu, Fe(II), Fe(III), Mn(II), Ni(II) should have these colourothers dunno

  • 1 十年前

    NH3 融在水中會變成NH4OH

    Reaction : NH3 + H2O ---> NH4OH precipitate excess

    Ag+ + NH4OH ---> AgOH which is white

    Ba(OH)2 white

    Ca(OH)2 white

    Cr(OH)3 green

    Cu(OH)2 blue @ blue solution

    Fe2+ green

    Fe3+ yellow

    K+ colourless

    Mg2+ white

    Mn2+ Very pale pink

    Na2+ Colourless

    NH4+ No such reaction

    Ni2+ green

    Pb2+ white

    Sn2+ white

    Zn 2+ white @colourless

    Hope this help

    2007-10-14 22:44:36 補充:

    The above person gives you the wrong answer, he doesn't even know NH3 will form NH4OH in water.....

    資料來源: ME
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