The pH of a 0.1 molar solution of the acid HQ is 3 . The value of the ionization constant, K_a of this acid is: - Chemistry MCQ AIEEE 2012 2026 | ExamTest.live

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The pH of a 0.1 molar solution of the acid HQ is 3 . The value of the ionization constant, K_{a} of this acid is:

Solution & Step-by-step Explanation

pH = 3 ⟹ [H^{+}] = 1 0^{- 3} M .For a weak acid: [H^{+}] = K_{a} C . 1 0^{- 3} = K_{a} \times 0.1 Squaring both sides: 1 0^{- 6} = K_{a} \times 0.1 K_{a} = \frac{1 0 ^{- 6}}{0.1} = 1 0^{- 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, K_{a} of this acid is:

3 \times 1 0^{- 1}

1 \times 1 0^{- 3}

1 \times 1 0^{- 5}

1 \times 1 0^{- 7}

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