• 2022-10-29
    配制pH=5左右的缓冲溶液,应选用下列体系为?()
    A: ANa2B4O7═HCl,pK1=9.24
    B: BNaH2PO4═Na2HPO4,pK2=7.2
    C: CHAc═NaAc,pKa=4.74
    D: DCH2ClCOOH═NaOH,pKa=2.85