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# The ionization constant of propanoic acid is 1.32 × 10^–5. Calculate the degree of ionization of the acid in its 0.05M solution and also its pH. What will be its degree of ionization if the solution is 0.01M in HCl also?

7.59     The ionization constant of propanoic acid is  . Calculate the degree of ionization of the acid in its 0.05M solution and also its pH. What will be its degree of ionization if the solution is 0.01M in HCl also?

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Let the degree of ionization of propanoic acid be . Then Let suppose we can write propanoic acid to be HA,

It is known that,

We have
ionization constant of propanoic acid ()=  and the concentration is 0.005 M

By putting the values in above formula we get,

[Acid] =  = C. =

Therefore,

If we add 0.01M hydrochloric acid then,

initial con                     C                               0                 0
at equi.                     C -   C                    0.01 +

Now, by using the formula of

The value of  is calculated as  ;
(Degree of ionisation)

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