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Grade: Upto college level

                        

the concentration of pure liquid and pure solid is assumed to be unity, in the eqilibrium constant equation..why???????..plz explain

9 years ago

Answers : (3)

Sudheesh Singanamalla
114 Points
							

The equilibrium concentration equation only deals with gaseous state compounds (those in gaseous state) . so solids and liquids are taken as unity.

9 years ago
Neer Varshney
76 Points
							

It is found experimentally that the equillibrium constant for the solid and liq. state is unity as there volume reamins constant. But in case of gases their molecules can expand freely and that is why there is change in concentration for different gases but unity for solids and liquids as they cant expand.

9 years ago
Sudheesh Singanamalla
114 Points
							

since there is not much change in the compunds in solid and liquid state in terms of their volume or the change is infinitesimally small , it is ignored

it is like 1-0.00001 in the denominator while calculating Kc , this value can be ignored in the denominator but not in the numerator .

9 years ago
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