题目内容

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

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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↓

The indicator used by Fayang judicature belongs to adsorption indicator.

When titrating the composition of Ca2+ and Mg2+ ions in water with EDTA, the commonly used indicator is ( )

A. xylenol orange
B. chromium black T-indicator
C. PAN (Cu-PAN)
D. calcium indicator