Practice question
Question
For HA <=> H+ + A- , if Ka = 1.0 × 10⁻⁵ and [HA] = 0.05 M at equilibrium, what is [H+] ?
Explanation
Ka = ([H+][A-]/[HA]) = (x²/0.05 - x) ≈ (x²/0.05) = 1.0 × 10⁻⁵ , x² = 5.0 × 10⁻⁷ , x = 7.07 × 10⁻⁴ M .
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