Double salt

  • Thread starter elitewarr
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  • #1
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Main Question or Discussion Point

How does double salt reactions work?

Let's say, Cu(NH4)2(SO4)2 + NaOH --> ??
OR maybe Cu(NH4)2(SO4)2 + BaCl2 --> ?

Thanks.
 

Answers and Replies

  • #2
Borek
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Think about each pair of ions seperately.

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  • #3
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So for the first equation, Cu(NH4)2(SO4)2 + NaOH gives NH3 + CuSO4 + Na2(SO4) + H2O?
Cu(NH4)2(SO4)2 + BaCl2 will give NH3 + BaSO4 + CuCl2 ?
 
  • #4
Borek
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Do you know what net ionic reaction is?

You are partially on the right track, partially wrong.

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  • #5
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Yes. I know what is ionic equation.
So, Cu(NH4)2(SO4)2 break down becomes Cu2+ + 2NH4+ + 2SO4 2-
NaOH will be Na+ and OH-.
So OH- + NH4+ --> NH4OH --> NH3 + H2O ?
and Cu2+ + 2SO4 2- + Na+ --> CuSO4 and Na2SO4?
 
  • #6
Borek
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Cu2+ + 2SO4 2- + Na+ --> CuSO4 and Na2SO4?
What you wrote seems to be suggesting that two salts precipitated - that's not the case. If mixed, all three ions are just spectators.

However, one of them can react with OH- and NH3...

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  • #7
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So Cu2+ will react with OH- ? But how do I know which ion will react?
 
  • #8
Borek
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Solubility rules - what do you know about solubility of hydroxides?

However, this is more complicated. Ammonia is a good complexing agent and it easily reacts with copper. I am afraid exact outcome depends on the amount of reactants used.

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