What is sodide ion ? How sodide ion stabilized in solution ?


What is sodide ion ? How sodide ion stabilized in solution ?


The sodide ion is Na -1. It is an anion like non metallic anions such as Cl - , Br  -, I etc . 
It has the electronic configuration  [ Ne ] 3s 2. Group  (I) metals ( Na , K , Rb ) are stable in liquid NH3

The solution is blue when dilute. The solution conduct electricity and are paramagnetic.


What is sodide ion ? How sodide ion stabilized in solution ?


These measurement of transport number suggest that the main carrier is solvated electrons by which is implied electrons which are free from their parents Na-atoms occupy cavities in the ligand.

Electron spin resonance studies have shown the presence of free electrons , but the decrease of para magnetism with increasing 

concentration suggest that ammoniated electrons can associated to far diamagnetic electron pairs.


How the electrons are associated with the ammonia molecule ?

A  suggestion has been made that in addition to solvated cations negative ions stabilized by solution may exist in dilute solution . 

This can be involved in an oxidation-reduction equilibrium involving the solvent S’ with S -1  ( solvated  electron )
      
  M + + 2 S -       M  -     +  2 S
In  addition ion pairing equilibrium are involved .
      ⇋  M  + + S -               M + S-  
 M + + M-         ⇋    M+ M-

Where  M= Na , LI, K ….. etc.

Fairly stable other such solution of group  I ( A ) metals  Containing  M  ions can be obtained  with solvents like  tetrahydrofuran ( THF) ethylene diethyl ether and orther methyl polyethers.




Summary




What is Sodide ion ? 
How sodide ion stabilized in solution ? 




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