Lecture_3-Amino_Acids

Lecture_3-Amino_Acids - AND? We use weak acids as buffers...

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WEAK ACIDS AND? We use weak acids as buffers to maintain the pH in laboratory studies. Useful pH buffering range is ± 1 pK a unit Which buffering pair would be best for maintaining a solution at pH 6.9 ? A. K 2 HPO 4 /K 3 PO 4 B. H 3 PO 4 /KH 2 PO 4 C. KH 2 /PO 4 /K 2 HPO 4 pK a values for H 3 PO 4 pK 1 = 2.14 pK 2 = 6.86 pK 3 = 12.4 AND? We use weak acids as buffers to maintain the pH in laboratory studies Useful pH buffering range is ± 1 pK a unit Which buffering pair would be best for maintaining a solution at pH 3.0 ? A. K 2 HPO 4 /K 3 PO 4 B. H 3 PO 4 /KH 2 PO 4 C. KH 2 /PO 4 /K 2 HPO 4 pK a values for H 3 PO 4 pK 1 = 2.14 pK 2 = 6.86 pK 3 = 12.4 The buffer capacity of a given buffer solution may be deFned as: A. the pH range in which the buffer is effective. B. the maximum amount of strong acid or strong base that can be added before a signiFcant change in pH occurs. C. the total buffer concentration in the solution. D. B and C E.
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Lecture_3-Amino_Acids - AND? We use weak acids as buffers...

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