配制pH=5.0的缓冲溶液,选用最佳缓冲对为
A: HNO2-NaNO2,pKa(HNO2)=3.37
B: HAc-NaAc,pKa(HAc)=4.75
C: HCN-NaCN,pKa(HCN)=7.75
D: NH3•H2O-NH4Cl,pKb(NH3•H2O)=7.75
A: HNO2-NaNO2,pKa(HNO2)=3.37
B: HAc-NaAc,pKa(HAc)=4.75
C: HCN-NaCN,pKa(HCN)=7.75
D: NH3•H2O-NH4Cl,pKb(NH3•H2O)=7.75
举一反三
- 配制pH=5.0的缓冲溶液,选用最佳缓冲对为() A: HNO2-NaNO2,pKa (HNO2)=3.37 B: HAc-NaAc,pKa(HAc)=4.75 C: HCN-NaCN,pKa(HCN)=7.75 D: NH3•H2O-NH4Cl,pKb(NH3•H2O)=4.75
- 配制pH=5.0的缓冲溶液,选用最佳缓冲对为() A: HNO2-NaNO2,pKa(HNO2)=3.37 B: HAc-NaAc,pKa(HAc)=4.75 C: HCN-NaCN,pKa(HCN)=7.75 D: NH3•H2O-NH4Cl,pKb(NH3•H2O)=4.75
- 配制pH=5.0的缓冲溶液,选用最佳缓冲对为() A: HNO2-NaNO2,pKa (HNO2)=3.37 B: HAc-NaAc,pKa(HAc)=4.75 C: HCN-NaCN,pKa(HCN)=7.75 D: NH3•H2O-NH4Cl,pKb(NH3•H2O)=4.75
- 欲配制pH=5的缓冲溶液,应选用下列( )共轭酸碱 对。 A: NH2OH2+—NH2OH(NH2OH的pKb=3.38) B: HAc-Ac-(HAc的pKa=4.74) C: NH +—NH •H O 4 3 2(NH3•H2O的pKb=4.74) D: HCOOH—HCOO-(HCOOH的pKa=3.74)
- 欲配制pH=5的缓冲溶液,应选用下列()共轭酸碱对。 A: NH<sub>2</sub>OH<sub>2</sub><sup>+</sup>—NH2OH(NH<sub>2</sub>OH的pKb=3.38) B: HAc—Ac<sup>-</sup>(HAc的pKa=4.74) C: NH<sub>4</sub><sup>+</sup>—NH3•H2O(NH<sub>3</sub>•H<sub>2</sub>O的pKb=4.74) D: HCOOH—HCOO<sup>-</sup>(HCOOH的pKa=3.74)