The alkali metals dissolve in
liquid ammonia. The colour of the solution is blue. The alkali metal atoms
ionise in solution.
The solution thus contains
ammoniated cations and ammoniated electrons. When light falls on the solution,
the ammoniated electrons are excited by absorbing energy corresponding to red
light and the light transmitted is blue. This imparts blue colour to the
When solution is concentrated,
the colour changes to bronze. This is due to the formation of metal ion
clusters which brings metallic lustre to solution.
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