Difference between revisions of "Double replacement"

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A '''double replacement''' or double displacement is a reaction where two cations exchange anions or vice versa.
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A '''double replacement''' or '''salt metathesis reaction''' is a reaction where two cations exchange anions or vice versa.
  
 
These reactions are usually in equilibrium; they proceed to completion in the following cases:
 
These reactions are usually in equilibrium; they proceed to completion in the following cases:
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* One of the resulting products is volatile and is distilled off the mixture (e.g. [[nitric acid]]);
 
* One of the resulting products is volatile and is distilled off the mixture (e.g. [[nitric acid]]);
 
* One of the resulting products is unstable and decomposes into non-ionic products such as gases and water (e.g. [[carbonic acid]]);
 
* One of the resulting products is unstable and decomposes into non-ionic products such as gases and water (e.g. [[carbonic acid]]);
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==References==
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<references/>
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===Relevant Sciencemadness threads===
  
 
[[Category:Reactions]]
 
[[Category:Reactions]]

Latest revision as of 18:27, 5 October 2018

A double replacement or salt metathesis reaction is a reaction where two cations exchange anions or vice versa.

These reactions are usually in equilibrium; they proceed to completion in the following cases:

  • One of the resulting products is insoluble and precipitates (e.g. barium sulfate);
  • One of the resulting products is a poorly dissociated, mostly molecular compound (e.g. water);
  • One of the resulting products is volatile and is distilled off the mixture (e.g. nitric acid);
  • One of the resulting products is unstable and decomposes into non-ionic products such as gases and water (e.g. carbonic acid);

References

Relevant Sciencemadness threads