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The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, of the acid is
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By Expert Faculty of Sri Chaitanya
a
3 × 10-1
b
1 × 10-3
c
1 × 10-5
d
1 × 10-7
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Correct option is C
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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