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JEE Main2017ChemistryIonic EquilibriumActual

Addition of sodium hydroxide solution to a weak acid (HA) results in a buffer of pH 6. If ionization constant of HA is 10 - 5 , the ratio of salt to acid concentration in the buffer solution will be:

Options

  1. A10 : 1
  2. B4 : 5
  3. C5 : 4
  4. D1 : 10

Correct answer

A. 10 : 1

Step-by-step solution

p H = p k a + l o g     S a l t   A c i d     ( ∵ [Salt]=[Anion] ) ⇒ 6 = 5 + log ⁡     S a l t A c i d ⇒ 1 = log  ⁡ S a l t A c i d ⇒ l o g 10 = log  ⁡ S a l t A c i d   S a l t a c i d = 10 1

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