Q.

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of the acid is

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a

3 × 10-1

b

1 × 10-3

c

1 × 10-5

d

1 × 10-7

answer is C.

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Detailed Solution

HQ=H+ + Q-H+  = KaC by Ostwald's dilution lawH+  = 10-pH= 10-3  M;  C = 0.1 MThus,            10-3= Ka× 0.110-6= Ka× 0.1∴    Ka =   10-5
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The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of the acid is