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Inorganic Chemistry

Cool goIITian

Joined:	23 Jul 2008
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27 Aug 2008 22:08:10 IST

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889

salt analysis continued

None

salt analysis continued

sol. of Zn salt+ammonium chloride+ammonium hydroxide+hydrogen sulphide(dirty white ppt------?)

HCl+hydrogen sulphide+dirty white ppt +heat.H2S

then add Potassium hexacyanoferrate(ii)(i.e potassium ferrocyanide)(bluish ppt ---?)

2)sol. of Co salt+ammonium chloride+ammonium hydroxide+hydrogen sulphide (black ppt got)

black ppt +aqua regia evaporate to dryness(blue residue-Co,yellow residue-Ni)+water.divide into 2 parts

1 part +acetic acid+KNO3(allowed to stand without shaking) yellow ppt got what is it?

ammonium cyanate +acetone+another part (blue colour organic layer got--what is it?)

3)yellow residue+water+dimethyl glyoxime +ammonium hydroxide--dark rosy or red ppt what is it?

To be continued...............sounds like end of 1st episode of salt analysis?

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Comments (2)

Starfire90

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Joined: 22 Jul 2008

Posts: 109

28 Aug 2008 10:51:10 IST

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1. bluish ppt is Zn₂[Fe(CN)₆]... ZnCl2 (i think) is formed that reacts wit ferrocyanide o giv blue ppt

2. CoS is soluble in conc HCl in presence of oxid. agent-- ie. Aqua regia..rite?

CoCl₂ is formed thus....<wads this blue residue yaar?!...its soluble! i think>

yellow ppt is potassiuom cobaltinitrate...

Co⁽NO2)2+ 3KNO₃ +2HNO₂ --> K₃[Co(NO₂)₆] +H2O +NO

blue clr in organic layer is (NH₄)₂[Co(CNS)₄) wich is caught in acetone layer...

red ppt is nickel dimethyl glyoximate.. cant draw structure here..contains coordinate conds Hbonds.. etc... refr any inorganic chem book..Arihant for eg

s.a. karthick

Cool goIITian

Joined: 23 Jul 2008

Posts: 53

30 Aug 2008 21:44:15 IST

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thank you bulma .very nice of u

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