The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is

The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of the acid is ionized is

  1. A

    4.5

  2. B

    2.5

  3. C

    9.5

  4. D

    7.0

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    Solution:

    For buffer solution :

    pH = pKa + log  SaltAcid = 4.5 + log  SaltAcid As HA is 50% ionized so  Salt = Acid pH = 4.5 pH + pOH = 14      pOH = 14 - 4.5 = 9.5

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