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Alkali Metal Like Sodium Displaces Hydrogen From Cold Water. Why?

Deleted User
08/06/2017 0 0

Sodium is a good reducing agent (i.e. liberates electron)  and therefore displaces hydrogen from water.

The reaction can be explained as under:

2Na0 +2H2+1O-2→2Na+1O-2H+1+H20

We can see sodium is oxidized to +1 oxidation state and hydrogen is reduced to 0 oxidation state.

This is a redox reaction  (reaction involving oxidation and reduction simultaneously )in which sodium gives electrons and these are accepted by hydrogen ions to form hydrogen gas.

2Na→2Na+ +2e- (oxidation)

2H+ +2e- →2H (reduction)

H+H→H2

 

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