SELECT * FROM question_mgmt as q WHERE id=3294 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=48 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

The pH of 0.1M solution of cyanic acid (HCNO) is 2.34. Calculate the ionization constant of the acid and its degree of ionization in the solution.

Answer:

c = 0.1 M

pH = 2.34

-log [H+] =  pH

-log [H+] = 2.34

[H+]  = 4.5 x 10-3

also

[H+]  = cα

4.5 x 10-3  =   0.1  α

α =  4.5 x 10-3  /  0.1

α  = 45 x 10-3 

Then,

Ka  =  cα2

= 0.1 (45 x 10-3)2

= 202.5 x  10-6

= 2.02 x 10-4

 


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