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Making a buffer solution with the optimum

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Reference no: EM132553626

Which of the following mixtures is suitable for making a buffer solution with the optimum pH of 9.2-9.3?

A) HCN / CN-

B) HCOOH / HCOO-

C) C5H5N/ C5H5NH+

D) NO2- / HNO2

E) NH3 / NH4+

Reference no: EM132553626

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