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Making Copper(II) Ammonium Sulphate


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#1 Dimdims

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Posted 26 September 2010 - 04:51 PM

For an investigation i've got to do in A-level Chemistry, i need to make Copper(II) Ammonium sulphate from scratch, could anyone please help me out as to how to do this as i haven't got a clue what to use


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#2 mississippichem

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Posted 26 September 2010 - 05:26 PM

For an investigation i've got to do in A-level Chemistry, i need to make Copper(II) Ammonium sulphate from scratch, could anyone please help me out as to how to do this as i haven't got a clue what to use


When you say from scratch, do you mean from anhydrous copper(II) sulphate? If so, just dissolve the copper(II) sulphate in a concentrated aqueous solution of ammonia [also known as ammonium hydroxide]. This should form the complex  [Cu(NH_3 )_4 ] SO_4 which is what you were looking for I believe.
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#3 Dimdims

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Posted 26 September 2010 - 05:31 PM

no, i first have to make the copper(II) sulphate, but the ammonia should be provided
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#4 mississippichem

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Posted 26 September 2010 - 05:36 PM

no, i first have to make the copper(II) sulphate, but the ammonia should be provided


Oh okay. mix a soluble copper salt with a soluble sulfate salt in aqueous solution. Then just play the solubility ballgame to make your copper sulfate percipitate out, or get the other compound to percipitate out and evaporate the solution to dryness.
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You've come a long way. Remember back when we defined what a velocity meant? Now we are talking about an antisymmetric tensor of second rank in four dimensions.

-Feynman Lectures on Physics II


#5 Dimdims

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Posted 26 September 2010 - 05:40 PM

ok, thanks for the help
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#6 John Cuthber

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Posted 26 September 2010 - 07:20 PM

First off, you need to find out exactly what you are being asked to make.
Is it the double salt CuSO4 (NH4)2SO4. 6H2O
or is it tetrammine copper (II) sulphate Cu(NH3) 4SO4 .H2O ( I think it's the monohydrate.)

I think it's probably the second, but the question actually asks for the first.

Edited by John Cuthber, 26 September 2010 - 07:22 PM.

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#7 Dimdims

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Posted 27 September 2010 - 09:58 AM

i have to make the double salt, i just wasnt sure how to make it
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#8 John Cuthber

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Posted 27 September 2010 - 06:32 PM

Then you need to prepare solutions of ammonium sulphate and copper sulphate, mix them and let the water evaporate.
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#9 mississippichem

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Posted 27 September 2010 - 08:57 PM

Oh sorry, I assumed you were trying to get the tetra-ammine complex. Where's the IUPAC when you need them? :)
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You've come a long way. Remember back when we defined what a velocity meant? Now we are talking about an antisymmetric tensor of second rank in four dimensions.

-Feynman Lectures on Physics II





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