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Question

A certain buffer solution contains equal concentration of X and HX. The Kb for X is 1010. The pH of the buffer is:
(correct answer +1, wrong answer -0.25)
  1. 4
  2. 7
  3. 14
  4. 10


Solution

The correct option is A 4
For a basic buffer,
pH=14pKblog[Salt][Base]
pH=14(log1010)log1
pH=4

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