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Bhargav Ch Grade: 12
        

sir i did not understand what is meant by common ion effect in acids and bases concept .so please explain about that

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

see this example


let we have aqueous solution of acetic acid ....


CH3COOH +H2O=CH3C00- + H3O+ 


its Ka=[CH3COO-][H3O+]/[CH3COOH]       ...............1


       Ka =CA2/1-A                       (A is degree of dissotion)


but if we have solution which containes acetic acid &  its salt (sodium acetate) then its degree of dissosiation is supressed...


CH3COONa =CH3COO-+Na+


 now we have CH3C00- as common ion so eq 1 becomes


Ka=[CH3COONa][H30+]/[CH3COOH]


Ka=A1[CH3COONa]/1-A1


A1 is new degree of dissotion


change in degree of dissociation by the presence of common ion in the solution is known as common ion effect..


 


 

6 years ago
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