‍‍‏欲配制pH=5.0的缓冲溶液，应选用（）缓冲对。‍‍ A: HCOOH-HCOONa [pKay (HCOOH) = 3.75] B: NH3-NH4Cl [pKby (NH3) = 4.75] C: NaH2PO4- Na2HPO4 [pKa2y (H3PO4) = 7.21] D: HAc-NaAc [pKay (HAc) = 4.74]

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2022-06-05 问题

‍‍‏欲配制pH=5.0的缓冲溶液，应选用（）缓冲对。‍‍ A: HCOOH-HCOONa [pKay (HCOOH) = 3.75] B: NH3-NH4Cl [pKby (NH3) = 4.75] C: NaH2PO4- Na2HPO4 [pKa2y (H3PO4) = 7.21] D: HAc-NaAc [pKay (HAc) = 4.74]

‍‍‏欲配制pH=5.0的缓冲溶液，应选用（ ） 缓冲对。‍‍ A: HCOOH-HCOONa [pKay (HCOOH) = 3.75] B: NH3-NH4Cl [pKby (NH3) = 4.75] C: NaH2PO4- Na2HPO4 [pKa2y (H3PO4) = 7.21] D: HAc-NaAc [pKay (HAc) = 4.74]

‍‍‏欲配制pH=5.0的缓冲溶液，应选用（）缓冲对。‍‍ A: HCOOH-HCOONa [pKay (HCOOH) = 3.75] B: NH3-NH4Cl [pKby (NH3) = 4.75] C: NaH2PO4- Na2HPO4 [pKa2y (H3PO4) = 7.21] D: HAc-NaAc [pKay (HAc) = 4.74]