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Which of the following is not a type of Acidic buffer mixture?

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Which of the following is not a type of Acidic buffer mixture?

(a) Na2HPO4 + Na3PO4

(b) CH3COOH+ CH3COONa

(c) H2CO3+Na2CO3

(d) H3PO4+NaH2PO4

This question was addressed to me in an interview.

This interesting question is from Buffers in division Introduction to Fermentation Processes & Media for Industrial Fermentation of Bioprocess Engineering

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The correct option is (a) Na2HPO4 + Na3PO4

To elaborate: Na2HPO4 + Na3PO4 is a type of simple buffer which is a combination of a mixture of an acid salt and normal salt of a poly basic acid.

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