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Question

Highly pure solution of sodium in liquid ammonia

Shows blue colour
Exhibits electrical conductivity
Produces hydrogen gas
Produces sodium anide

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Solution

The solution of sodium in liquid ammonia is quite stable on its own.

You need to add a small amount of a catalyst such asFeCl3for the sodium to react with the ammonia to form sodium amide and hydrogen gas.

2Na(s) + 2NH3(l)FeCl3m−−−→2NaNH2(NH3)+H2(g) It dosenot ptoduce hydrogen gass and sodium anide

*)In dilutesolutionsofNain ammonia, the solvated electrons have a deep blue colour.

In more concentrated solutions, the solution takes on a bronze/copper colour. When it shows blue colour *)

The equation is

Na(s)+(x+y)NH3(l)→Na+(NH3)x+e−(NH3)

The solution exhibits electricity because the solvated ions and electrons can carry the current.

The conductivity obviously depends on the concentration, but concentrated solutions (> 3 mol/L) are better conductors than liquid mercury. When it exhibits electrical conductivity


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