欲配制pH=3.5的缓冲溶液,应选择的缓冲对是()
A: HCOOH(pKa=3.76)和HCOONa
B: HPO(pKa1=2.16)和NaHPO
C: NHCl和NH(pKb=4.75)
D: HAc(pKa=4.75)和NaAc
A: HCOOH(pKa=3.76)和HCOONa
B: HPO(pKa1=2.16)和NaHPO
C: NHCl和NH(pKb=4.75)
D: HAc(pKa=4.75)和NaAc
举一反三
- 欲配制pH=3.5的缓冲溶液,应选择的缓冲对是() A: HCOOH(pKa=3.76)和HCOONa B: H3PO4(pKa1=2.16)和NaH2PO4 C: NH4Cl和NH3(pKb=4.75) D: HAc(pKa=4.75)和NaAc
- 今要配制pH=3.5的缓冲溶液,选用下面什么缓冲对最为合适? A: H3PO4—NaH2PO4(pKa1=2.13) B: HCOOH—HCOONa(pKa=3.76) C: H2C8H4O4—KHC8H4O4(pKa1=2.95) D: HAc—NaAc(pKa=4.75)
- 配制pH=9.0的缓冲溶液,应选用哪对缓冲对 A: NH4Cl—NH3·H2O (pKb=4.75) B: HCOOH—HCOONa (pKa=3.5) C: H2PO4-—HPO42-(pKa =7.21) D: HAc—Ac- (pKa =4.75)
- 配制pH=9.0的缓冲溶液,应选用哪对缓冲对 A: HCOOH—HCOONa (pKa=3.5) B: HAc—Ac- (pKa =4.75) C: NH4Cl—NH3·H2O (pKb=4.75) D: H2PO4-—HPO42-(pKa =7.21)
- 配制pH=9.0的缓冲溶液,应选用( )缓冲对。 A: H2PO4--HPO42-(pKa=7.21) B: NH4Cl-NH3·H2O (pKb=4.75) C: HCOOH-HCOONa (pKa=3.5) D: HAc-Ac-(pKa=4.75)