plz someone solve this..
conc nitric acid prepared in laboratory is yellow in colour.. why? how is this colour removed ?
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plz someone solve this..
conc nitric acid prepared in laboratory is yellow in colour.. why? how is this colour removed ?
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4HNO3--> 4NO2 + 2H2O + O2
This NO2 dissolves in the solution and produces a yellow colour.
To remove this, CO2 is bubbled in, which shifts the liquid-vapour equilibria of NO2, and removes it from solution, which gets oxidized and forms HNO3 again, thus the yellow colour is removed.