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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

Which of the following would cause the percent ionization of a week acid to increase?

Options

  1. AAddition of a strong acid
  2. BAddition of a salt containing its conjugate base
  3. CDiluting with more water
  4. DThe percent ionization of a week acid is a constant and cannot be increased.

Correct answer

C. Diluting with more water

Step-by-step solution

K a = C α 2 1 - α . If α < 5 % , then 1 - α = 1 So K a = C α 2 or α = K a C This shows that degree of ionization is inversely proportional to the square root of its molar concentration. Hence, α increases when solution is diluted with water.

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