Fri October 07, 2011 By: Aditya Varna

why does'nt the dissociation constant have any unit eventhough by formula it should?

Expert Reply
Mon October 10, 2011
Dissociation constants can also be expressed as dimensionless quantities if the standard state of reactants and products are specified.  Standard state (c0) for a solute is 1 molar solution and all concentrations can be measured with respect to it.Therefore a concentration of  4 molar in standard state can be expressed as 4 molar/1 molar = 4, which is a dimensionless number. The numerical value of dissociation constant depends on the standard state chosen. 
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