A.3.0
B.5.0
C.9.0
D.11.0
某氯化物溶液100ml,今移取25.00ml溶液3份,用浓度为(0.1057±0.0002)mo/L(±S)的AgNO3溶液滴定,分别消耗AgNO3溶液35.15ml,35.22ml和35.19ml,按偶然误差传递规则计算该氯化物溶液中Cl-的量(mmol/L)。
DNA的解链温度(Tm)受介质离子强度的影响。当E.coli的DNA处于下述哪种介质中测定其Tm值时,Tm值最高?()
A.0.05 mol/L的KCl
B.0.1 mol/L的KCl
C.0.5 mol/L的KCl
D.1.0 mol/L的KCI
A.无沉淀析出
B.有沉淀析出
C.析出沉淀后又溶解
D.不一定
A.NaCN(Ka=6.2x10-10)
B.NaAc(Ka=1.7x10-5)
C.C6H5Na(Ka=1.0x10-10)
D.CH3NH2(Ka=2.3x10-11)
A.5%,0.1mol/L
B.10%,0.1mol/L
C.5%,0.01mol/L
D.10%,0.01mol/L
A.Hg/Hg2Cl2(1mol/L)/KCl(饱和)
B.Hg/Hg2Cl2(固)/KCl(饱和)
C.Hg/Hg2Cl2(固)/KCl(1mol/L)
D.Hg/HgCl2(固)/KCl(饱和)
A.5%,0.1mol/L
B.10%,0.1mol/L
C.5%,0.01mol/L
D.10%,0.01mol/L