题目内容

In the precipitation titration method, the indicator used by the Volhard method is ( ).

A. K2CrO4
B. NH4Fe(SO4)2
C. adsorption indicator
D. to judge

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To make c(S2-) 1×10-8 mol/L, the pH value of H2S saturated solution should be controlled as ( ).[Ka1Ө(H2S)=8.9×10-8，Ka2Ө(H2S)=1.2×10-13]

A. 7.02
B. 13.89
C. 5.99
D. 7.50

The solubility of PbCl2 in 0.10 mol·L-1 NaCl solution is ( ) mol/L.[KspӨ(PbCl2)=1.7×10-5]

A. 1.7×10-4
B. 1.7×10-3
C. 1.6×10-2
D. 4.1×10-2

In a mixed solution containing Cl- and CrO42-ions with both concentrations of 0.010 mol/L, AgNO3 solution was gradually dropped (ignoring the change of volume), and the first ion to precipitate was ( ).[KspӨ(AgCl)=1.77×10-10, KspӨ(Ag2CrO4)=1.12×10-12]

A. Cl-
B. CrO42-
C. Simultaneous precipitation of Cl- and CrO42-
D. could not be determined

Which of the following precipitation reaction not belong to the silver method （）

Ag+ +Cl-=AgCl↓
B. Ag+ +I-=AgI↓
C. Ag+ +SCN-=AgSCN↓
D. 2Ag+ +S2-=Ag2S↓