AIEEE 2012 Solutions Q1 Chemistry Code B

1. The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, Ka of this acid is :
(1) 1 ´ 10-5 (2) 1 ´ 10-7
` (3) 3 ´ 10-1 (4) 1 ´ 10-3
Sol. (1)
pH = (pKa --logc) Þ 3 = (pKa + 1 )
6 = pKa + 1
pKa = 5
Ka = 10--5"

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