Calculate Ka from pKa of a weak acid

Practice question

Question

The pKa of a weak acid is 5.2. What is its Ka ?

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5.2 × 10⁻⁵ 1.0 × 10⁻⁵ 6.31 × 10⁻⁶ Correct 2.0 × 10⁻⁶

pKa = -log Ka , so Ka = 10⁻pKa = 10⁻⁵.² ≈ 6.31 × 10⁻⁶ .

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