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NEET2013ChemistryIonic EquilibriumActual

The dissociation constant of a weak acid is 1 10⁻⁴ . In order to prepare a buffer solution with a pH =5 , the [Salt]/ [Acid] ratio should be:

Options

  1. A4: 5
  2. B10: 1
  3. C5: 4
  4. D1: 10

Correct answer

B. 10: 1

Step-by-step solution

pH = pK _a+ [ Salt ] Acid aligned & 5= [1 10⁻⁴ ]+ [ Salt ] [ Acid ] & 5=4+ [ Salt ] [ Acid ] & [ Salt ] [ Acid ] =10: 1 aligned

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