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:

Engineering

Chemistry

pH Calculation for Acids and Bases

Question

1 × 10^–3

1 × 10^–7

3 × 10^–1

1 × 10^–5

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pH = 3 ⇒ [H⁺] = 10^–3 M = αC

$α = \frac{10^{- 3}}{C} = \frac{10^{- 3}}{0.1} = 0.01 < < 1$

$∴$ Ka = α²C = (0.01)² × 0.1 = 1 × 10^–5