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SOHAN SARANGI Grade: 12
        

Find the pH and % dissociation of HAc in a solution obtained by mixing 25ml of 0.2M HCl and 25ml of 0.2M NaAc. Given Ka for HAc is 1.78*10-5

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

  HCl               +                CH3COONA             =>               CH3COOH   +   NaCl


25*0.2 (millimoles)           25*0.2(mllimoles)      => 0                   0                                 (initial)


 0                                            0                                           25*0.2          25*0.2           (final)


total millimoles of acetic acid = 25*0.2


total volume = 50ml


molarity of acetic acid (C)= 25*0.2/50=0.1


degree of dissotiation = (Ka/c)1/2 = (1.78*10-4)1/2


                                                 =1.33%

6 years ago
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