• 2022-06-26
    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