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Qualitative Analysis

CrO 4 2-. MnO 4 1-. Cr 2 O 7 2-. Qualitative Analysis. Cu 1+. Cu 2+. The presence of different ions in aqueous solution can be identified in a number of ways. One method is to add a soluble ionic substance which combines with the unknown ion and forms an insoluble precipitate.

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Qualitative Analysis

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  1. CrO42- MnO41- Cr2O72- Qualitative Analysis Cu1+ Cu2+

  2. The presence of different ions in aqueous solution can be identified in a number of ways. One method is to add a soluble ionic substance which combines with the unknown ion and forms an insoluble precipitate. Thesimplestmethodisbycolour.

  3. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple

  4. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it?

  5. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? copper(II) sulfite

  6. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? sodium dichromate

  7. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? nickel(II) nitrate

  8. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? potasssium chromate

  9. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? sodium permanganate

  10. Ion Colour of Solution See page 341 groups 1,2,17 are colourless Cr3+(aq) Cr2+(aq) Co2+(aq) Cu2+(aq) Cu1+(aq) Fe3+(aq) Fe2+(aq) Mn2+(aq) Ni2+(aq) CrO42-(aq) Cr2O72-(aq) MnO4-1(aq) green blue pink blue green yellow-brown pale-green pale pink green yellow orange purple sodium dichromate potassium chloride sodium permanganate nickel(II) nitrate copper(II)sulfite potassium chromate which is it? solution ? potassium chloride

  11. Try Practice questions 1-4 pg 342 Flame tests can also be used to identify different ions in solution

  12. Sequential Qualitative Analysis

  13. If a solution contains more than 1 ion, these ions can be removed 1 at a time if the right solutions are added in the right sequence. Suppose a solution was thought to contain both Ag1+(aq) and Pb2+(aq). If a solution containing Cl1-(aq) was added it would precipitate out both ions at the same time. How could one of these ions be removed without removing the other? Look for an anion which precipitates out only one of them.

  14. page 324 An excess of acetate ion, C2H3O21-(aq), removes only Ag1+(aq) so any soluble salt containing this ion, NaC2H3O2(aq),for instance, can be used to get rid of all the silver.

  15. solution thought to contain Ag1+(aq) and Pb2+(aq) add NaC2H3O2(aq) precipitate of AgC2H3O2(s) no precipitate of Ag1+(aq) filter precipitate of PbCl2(s) add NaCl no precipitate of Pb2+(aq) filter

  16. Try investigation 7.5.1 pg. 345 Practice questions pg 346 #5,7,8,9.

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