题目内容

已知HAc的pKa=4.75，将0.01mo/LHAc溶液与0.1mol/LNaAc溶液等体积混合，则此须缓冲溶液的pH为()

A. 3.75
B. 4.75
C. 5.75
D. 9.25

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298K时，H3PO4的pKa1=2.17、pKa2=7.21、pKa3=12.20。欲配制pH为7的缓冲溶液，可以选择的缓冲对为()

A. H3PO4-H2PO4-
B. H2PO4--HPO42-
C. HPO42--PO43-
D. 纯水

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