What is the ionizing constant of acetic acid (CH3COOH)?

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RPF SI (2018) Official Paper (Held On: 19 Dec, 2018 Shift 1)
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  1. 2.74 × 10-5
  2. 1.74 × 10-5
  3. 3.74 × 10-5
  4. 1.34 × 10-5

Answer (Detailed Solution Below)

Option 2 : 1.74 × 10-5
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The correct answer is 1.74 × 10-5

Key Points

  • 1.74 × 10-5 is the ionizing constant (Ka) of acetic acid (CH3COOH).
  • The ionizing constant is a measure of the strength of an acid in solution.
  • Acetic acid is a weak acid, and its ionizing constant reflects its partial ionization in water.
  • The value indicates the extent to which acetic acid dissociates into its ions in aqueous solution.

Additional Information

  • The dissociation of acetic acid in water can be represented by the equation: CH3COOH ⇌ CH3COO- + H+.
  • Ka is calculated using the concentrations of the products and reactants at equilibrium: Ka = [CH3COO-][H+]/[CH3COOH].
  • The low value of Ka for acetic acid indicates that it does not ionize completely in water, characteristic of weak acids.
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