cherrybunny
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The following tests were carried out to identify an unknown green salt Y.
An aqueous solution of Y gave a cream precipitate of compound A when reacted with
silver nitrate solution.
Compound A gave a colourless solution when reacted with concentrated ammonia solution.
Another aqueous solution of Y gave a green precipitate B when reacted with sodium carbonate solution.
The green precipitate B was filtered and dried and then reacted with sulfuric acid to give a pale green solution containing compound C and a colourless gas D.

Identify by name or formula the compounds A, B, C, D and Y.


i literally have no idea what B,C,D and Y is? like i cant find this information anywhere on the specification.

answers:
A Silverbromide/AgBr
B Iron(II) carbonate / FeCO3 C Iron(II) sulphate/ FeSO4
C Iron(II) sulphate/ FeSO4
D Carbondioxide/CO2
Y Iron(II) bromide/ FeBr2
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Theobromine
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It should be in the A2 transition metals section of inorganic.

Y being green tells you that it is an iron (II) compound.
Reaction of iron(II) complexes with sodium carbonate forms iron(II) carbonate, hence B.
Reaction of metal carbonate with sulphuric acid gives metal sulphate (C) and water and CO2(colourless gas D)

If something forms a cream precipitate with acidified silver nitrate, it must contain bromide ions.

So, combining this with the knowledge that iron (II) compounds are green, Y must be iron(II) bromide.

This information should all have been covered in A2 inorganic chemistry transition metals, so perhaps try looking in A2 inorganic for this material.

Hope this helped.
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cherrybunny
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(Original post by Theobromine)
It should be in the A2 transition metals section of inorganic.

Y being green tells you that it is an iron (II) compound.
Reaction of iron(II) complexes with sodium carbonate forms iron(II) carbonate, hence B.
Reaction of metal carbonate with sulphuric acid gives metal sulphate (C) and water and CO2(colourless gas D)

If something forms a cream precipitate with acidified silver nitrate, it must contain bromide ions.

So, combining this with the knowledge that iron (II) compounds are green, Y must be iron(II) bromide.

This information should all have been covered in A2 inorganic chemistry transition metals, so perhaps try looking in A2 inorganic for this material.

Hope this helped.
thank you so much
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