[niravp1]

I need to separate fecl2 from aqua solution in any form liquid or solid. Is there any catalyst or chemical agent available that can apart fecl2 from water??
please suggest...

[kriggy]

Evaporate the water?

[niravp1]

for that I need huge amount of heat, any other option please....

[kriggy]

Ok do you need the FeCl₂ for future aplication? Or do you just want to get rid of it? If the latter then you can precipitate if by adding solution of amonia and then filter it

[Zyklonb]

If your goal is to isolate anhydrous FeCl₂ from aqueous solution, then you're out of luck.
It is not possible to dehydrate any iron chloride - especially from a solution.
 If buying is not an option, then the only (practical) way to make it is from dry chlorine or dry HCl - neither are options for a beginner.
If you heat a solution of iron (II) or (III) chloride it will decompose to HCl and iron oxide/hydroxide.

[niravp1]

okk then what about this,
fecl2+H2SO4= Feso4+ Hcl
what are the conditions for this reaction??

[Hunter2]

This will also not work, because you need the water away first. Otherwise you have then iron, chloride ,sulfate in your water. The whole thing is acid.
Additionally iron-II will be oxidized to iron-III  by the oxygen from air.

If you want to get the the iron away a ion exchanger would work fine.

[Zyklonb]

Or if you're just trying to extract the iron, you could precipitate it's hydroxide by neutralizing with ammonia or other OH source.

[Hunter2]

But in this case iron is exchanged to ammonium. I think this is even more worse.
Ion exchange or reversed osmosis is the only wy to make pure water.  The evaporation was already mentioned.

[niravp1]

thanx buddies for your replies, but in case of sulphate i read somewhere that at low temperature it's solubility decreases and forms crystals. is it true??

[Hunter2]

Every salt will form crystalls by lowering temperture.

[Borek]

Every salt will form crystalls by lowering temperture.

Most salts, not every salt. For example solubilities of cerium sulfate and calcium acetate decrease with temperature.