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Which of the following is not a simple buffer?

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Which of the following is not a simple buffer?

(a) CH3COONH4

(b) NH4CN

(c) H3PO4 + NaH2PO4

(d) (NH4)2 CO3

I got this question in exam.

The origin of the question is Buffers topic in division Introduction to Fermentation Processes & Media for Industrial Fermentation of Bioprocess Engineering

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Correct answer is (c) H3PO4 + NaH2PO4

The explanation: H3PO4 + NaH2PO4 is a type of mixed buffer of acidic buffer mixture which is combination of a weak acid with its salt of strong base.

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