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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

What is the [ H + ] in a 0.40 M solution of HOCl, K a = 3.5 × 1 0 - 8 ?

Options

  1. A1.4 × 1 0 - 8 M
  2. B1.2 × 1 0 - 4 M
  3. C1.9 × 1 0 - 4 M
  4. D3.7 × 1 0 - 4 M

Correct answer

B. 1.2 × 1 0 - 4 M

Step-by-step solution

HOCl ⇌ H + + OCl - C 1 - α C α C α k α = C α 2 H ⊕ = C α = k a × C = 3.5 × 10 - 8 × 0.40 H + = 1.83 × 10 - 14

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