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Which of the following aqueous solution/s will have a pH value between 4.0 and 5.0 at 25^ C ?

Options

  1. A0.01 M solution of benzoic acid ( K _ a =6.6 10⁻⁵ . at .25^ C )
  2. B0.02 mol benzoic acid and 0.05 mol sodium benzoate dissolved in appropriate amount of water to make a solution
  3. CA mixture of 999 mL water and 1 mL 0.2 M HCl
  4. D499 mL of 0.01 M NaOH and 501 mL of 0.01 M HCl mixed together

Correct answer

D. 499 mL of 0.01 M NaOH and 501 mL of 0.01 M HCl mixed together

Step-by-step solution

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