. Calculate the degree of ionization of 0.05M acetic acid if its


pKa value is 4.74. How is the degree of dissociation affected when its solution also contains (a) 0.01 M (b) 0.1 M in HCl?

Best Answer

Answer: 

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When HCl is added to the solution, the concentration of H+ ions will increase. Therefore, the equilibrium will shift in the backward direction i.e., dissociation of acetic acid will decrease. 

Case I: When 0.01 M HCl is taken. 

Let x be the amount of acetic acid dissociated after the addition of HCl.

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Case II: When 0.1 M HCl is taken.

Let the amount of acetic acid dissociated in this case be X. As we have done in the first case, the concentrations of various species involved in the reaction are:

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