题目内容

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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