For preparing a buffer solution of pH = ...

For preparing a buffer solution of pH = 7.0 which buffer system you will choose?

A

`H_(3),PO_(4), H_(2)PO_(4)^(-)`

B

`H_(2)PO_(4)^(-),HPO_(4)^(2-)`

C

`HPO_(4)^(2-), PO_(4)^(3-)`

D

`H_(3)PO_(4),PO_(4)^(3-)`

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The correct Answer is:

B

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