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a is b

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In the process of spectrophotometric analysis, in order to reduce the influence of measurement errors, what range should the absorbance of the solution be controlled?

A. 0.1-1.0
B. 0.2-0.8
C. 1.0-2.0
D. 2.0-8.0

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The concentrations of Cl-，Br- and I- can be determined respectively by Mohr method.

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Add AgNO3 solution to 0.10 mol/L NaCl solution, resulting in white precipitation. Then add ammonia water to the solution, the precipitation gradually dissolves, and add KI solution to the system, resulting in yellow precipitation, which indicates ( ).

A. KspӨ(AgCl) > KspӨ(AgI)
B. KspӨ(AgCl) < KspӨ(AgI)
C. KspӨ(AgCl) = KspӨ(AgI)
D. cannot be explained

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Which of the following statements is true ( )

A. Mohr method can determine the concentration of Cl-、I- and Ag+
B. The ions that can be determined by Volhard method include Cl-、Br-、I-、SCN- and Ag+
C. The ions that can onlybe determined byVolhard method are Cl-、Br-、I- and SCN-
D. The selection of adsorptive indicators in the precipitation titration requires that the adsorptive capacity of the precipitated colloidal particles to the indicator should be slightly larger than that of the ions to be measured

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