CBSE Class 11-science Answered
Alkali metals dissolve in liquid ammonia to give a blue coloured solution. Why does the solution turn bronze when the concentration is increased?
Asked by jazcel | 09 Jan, 2016, 05:08: PM
Expert Answer
All alkali metal dissolve in liquid ammonia giving highly conducting deep blue solutions.These solutions contain ammoniated cations and ammoniated electrons as shown below:
M + ( x + y ) NH3 → M+ ( NH3 )x + e-(NH3)y
Dilute solutions of alkali metals in liquid ammonia are dark blue in colour but as the concentration increases above 3 M, the colour changes to copper-bronze and the solutions acquire metallic lustre due to formation of metal ion clusters.
Answered by Prachi Sawant | 10 Jan, 2016, 03:43: PM
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