1 / 15

Qualitative

Qualitative. Analysis. salt solution. dil. HCl. confirms the. solution + ppt. presence of. Grp. 1 cations. 2+. +. 2+. Pb , Ag , Hg. H S. 2. 2. confirms the. solution + ppt. presence of. black. Grp. 2 cations. 2+. 3+. 2+. Pb , Bi , Cu. Grp. 1. ppt. 2+.

donar
Download Presentation

Qualitative

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Qualitative Analysis

  2. salt solution dil. HCl confirms the solution + ppt. presence of Grp. 1 cations 2+ + 2+ Pb , Ag , Hg H S 2 2 confirms the solution + ppt. presence of black Grp. 2 cations 2+ 3+ 2+ Pb , Bi , Cu

  3. Grp. 1 ppt. 2+ dissolves in hot water Pb present + dissolves in aq. NH Ag present 3 2+ blackened by NH Hg present 2 3

  4. Confirmatory test 2+ Pb soln. yellow ppt. yellow ppt. K CrO KI 2 4 + Ag soln. white ppt. yellow ppt. HNO KI 3 2+ Hg black ppt. + Aqua regia 2 Grey SnCl white ppt. + SnCl 2 2

  5. Confirmatory test 3+ Bi ppt. + HNO 3 black ppt. white ppt. HCl+ Na SnO NH OH 4 2 2 2+ Cu ppt. + HNO 3 white ppt. yellow ppt. HNO KI 3 2+ Pb ppt. + HNO 3 yellow ppt. yellow ppt. K CrO KI 2 4

  6. solution NH Cl + dil.HNO + NH OH 4 3 4 Grp. 3 present reddish-brown dirty green white solution + ppt. 3+ Fe 3+ Cr 3+ Al H S 2 Grp. 4 present solution + ppt. 2+ white Zn 3+ buff coloured Al

  7. Confirmatory test 3+ Fe HCl + ppt. (insoluble in NaOH) CH COOH blood red ppt. 3 blue ppt. KCNS K [Fe(CN) ] 4 6 Pot.ferrocynate 3+ Cr HNO + ppt. (insoluble in NaOH) 3 yellow ppt. yellow ppt. Lead acetate NaOH + Br water 3+ HNO + ppt. (soluble in NaOH) Al 3 NH Cl + H O 2 white ppt. 4

  8. Confirmatory test 2+ Zn ppt. soluble in HCl white ppt. white ppt. CH COOH + K [Fe(CN) ] NaOH + H S 3 4 6 2 2+ Mn ppt. soluble in HCl black or brown purple colour PbO + HNO NaOH 2 3

  9. solution (NH ) CO 4 2 3 Grp. 5 present solution + ppt. 2+ 2+ Ca , Ba Flame colour 2+ red - Ca green - Ba (NH ) HCO 2+ 4 2 3 2+ solution + ppt. Mg present

  10. Anions Dil. H SO Test 2 4 smell of rotten egg 2- turns lead acetate paper black S 2- pungent smell S0 turns acidified K CrO soln. green 2 4 3

  11. Conc. H SO Test 2 4 pungent smell , white fumes with NH OH chromyl chloride Cl red vapours K Cr O + conc. H SO NaOH 2 2 7 4 2 4 yellow ppt. HNO + AgNO 3 3 Br reddish brown fumes yellow ppt.

  12. violet pungent vapours turning starch paper blue I present 2 HNO + AgNO 3 3 yellow ppt. insoluble in NH 3 brown pungent fumes intensified by adding Cu pieces 2- NO present 3 Ring test

  13. A salt mixture containing compounds [A, yellow solid] and [B, colourless solid] gives a lilac colour in the flame test.  Its aqueous solution : • (a)  is alkaline.  On passing H2S, it gives a black precipitate [C] which is soluble only in aqua regia.  Evaporation of the aqua regia solution followed by extraction with dilute HCl and treatment with SnCl2 yields a greyish-black precipitate. • (b)  On adding NH4OH, gives and orange brown precipitate [D].  The Na2CO3 extract of the salt mixture gives the following tests : • (i)  On acidification with dilute HNO3 followed by addition of AgNO3 gives a yellow precipitate which is insoluble in NH3. • (ii)  On acidification with dilute HCl followed by shaking with FeCl3 and CCl4 gives a violet colouration in CCl4 layer. • Identify compounds [A] and [B] of the mixture and the precipitates [C] and [D]. • Solution:   •           [A] = HgO;         [B] = KI;              [C] = HgS;          [D] = NH2Hg2I3

  14. manikm@iitk.ac.in

  15. Thanks

More Related