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Explain the dynamic nature of chemical equilibrium with suitable reaction of example. |
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Answer» Solution :Chemical equilibrium is also dynamic in nature. This fact is prove by synthesis of ammonia by use of `H_2` and `D_2`. After equilibrium is attained, these two MIXTURES (i) `H_2, N_2, NH_3` and (ii) `D_2, N_2` and `ND_3` are mixed together and LEFT for a while. Later, when this mixture is analysed it is found that the concentration of ammonia is just the same as before. When this mixture is analysed by a mass spectrometer, it is found that ammonia and all deuterium containing forms of ammonia (`NH_3, NH_2D, NHD_2` and `ND_3`) and dihydrogen and its deutrated forms (`H_2, HD` and `D_2`) are present. So it is clear that, scrambling of H and D atoms in the MOLECULES must result from a continuation of the forward and reverse reaction in the mixture. Use of ISOTOPE (deuterium) in the FORMATION of ammonia clearly indicates that, chemical reactions reach a state of dynamic equilibrium in which the rates of forward and reverse reactions are equal and there is no net change in composition. |
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