Question

what happens when alkali metals dissolve in liquid ammonia??​

Answer 1

Answer:

All alkali metals dissolves in liquid ammonia and produce blue coloured solutions which are conducting and reducing in nature due to presence of ammoniated electron. The ammoniated electron which absorbs energy in the visible region of light and thus imparts blue colour to the solution.

Explanation:

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Answer 2

Alkali metals dissolve in liquid ammonia giving deep blue solution which is conducting in nature .

As the concentration increases the colour changes to bronze and conductivity decreases.

In the solution the alkali metal atom readily loose one electron .

Both the cation and electron combine with ammonia to form ammoniated cation and ammoniated electron .

M + (x+y)NH3 gives [ M(NH3)x]^(+1) + [e(NH3)y]^(-1)

Ammoniated electron is responsible for the blue colour of the solution

The electrical conductivity is due to ammoniated cation and ammoniated electron

The dilute solution is paramagnetic becoz they contain free ammoniated electrons.

When concentration increases then the ammoniated metal ions may get bound by free unpaired electrons .

This is described as expanded metals .

Thus solution becomes bronze in colour and the paramagnetic character decreases.

The decrease in paramagnetic character suggest that in concentrated solution the ammoniated electrons also associate to form electron pair.

2e-(NH3)y gives [e(NH3)y]2

This blue colour solution i.e. less concentrated solution is paramagnetic but bronze colour solution is concentrated is diamagnetic in nature .