11
Tush Watts
·2009-11-20 06:07:39
Ans 1) Anhydrous iron(III) chloride may be prepared by union of the elements
2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s)
Ans 2) The structure of FeCl3.6H2O normally consists of trans [Fe (H2O) 4 Cl 2] Cl . 2 H2O, though in strong H Cl it forms tetrahedral [ Fe Cl 4] -
24
eureka123
·2009-11-20 06:14:43
tush u r rite...
asish u rong,,
plz answer otehr ques too
19
Debotosh..
·2009-11-20 06:21:33
good job tushar....you seem to be thorough with inorganic !
1
Arka Halder
·2009-11-20 08:50:16
Ferrous and Ferric ions maybe distinguished by adding NaOH or NH4OH to their salt solutions which form green and reddish brown precipitate respectively.
Anhydrous FeCl3 can be prepared by the direct combination of Fe and Cl2,as mentioned by Tushar.
11
Tush Watts
·2009-11-21 00:46:26
Ans 3)
REAGENT NaOH K4Fe(CN)6
Fe 2+ green ppt White ppt turning blue rapidly
Fe 3+ red brown ppt Prussian blue ppt
K3Fe(CN)6 KSCN
Turnbull's blue ppt no colour
red brown colour deep red colour
(no ppt)
19
Debotosh..
·2009-11-21 06:40:08
where did u get all these ?
deserves a pink ....really good!! carry on !!!
13
Avik
·2009-11-21 09:55:52
Q4) - Qualitative Estimation or Quantitative ??
I can tell qualitative, but quantitative....pata nahi...
Qualitatively estimating Fe3+ ions....
1) With K4[Fe(CN)6] ----> Ferri ferro cyanide (Prussian blue colouration)
2) With CNS- ------> Fe(CNS)3 (Red)
3) With CH3COO- -----> Fe(CH3COO)3 (Blood red)
24
eureka123
·2009-11-21 10:14:28
Ans 3 given is acidified soln of KMnO4
24
eureka123
·2009-11-21 10:16:09
ok..i will give options for Q4 to reduce confusion
a)titrating against acidified KMnO4
b)Titrating against mohr salt soln
c)titrating against oxalic acid soln
d)first reducing ferric ions by stannous chloride and then titrating against a soln of acidified KMnO4