欲配制pH=5的缓冲溶液,应选用下列()共轭酸碱对。
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NH2OH2+—NH2OH(NH2OH的pKb=3.38)
HAc—Ac-(HAc的pKa=4.74)
NH4+—NH3•H2O(NH3•H2O的pKb=4.74)
HCOOH—HCOO-(HCOOH的pKa=3.74)
参考答案:
NH2OH2+—NH2OH(NH2OH的pKb=3.38)
HAc—Ac-(HAc的pKa=4.74)
NH4+—NH3•H2O(NH3•H2O的pKb=4.74)
HCOOH—HCOO-(HCOOH的pKa=3.74)
参考答案: