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Question

Total numbers of buffers can be made by reaction of H3PO4 and NaOH is 
  1. 1
  2. 4
  3. 2
  4. 3


Solution

The correct option is D 3
H3PO4 has 3 replacable or acidic protons.
H2PO4 and HPO24and PO34 all these three ions can react differently with NaOH molecule to form three different solutions that can act as buffer solution. 
hence, total number of buffer can be made is equal to three.

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