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The increase of acidity leads to a decrease in αY(H) and an increase in the actual stability of EDTA complexes.

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The correct way to prepare NaOH standard solution is ( ).

A. indirect formulation method (calibration method)
B. use an analytical balance to weigh the reagent
C. dissolve a small amount of distilled water in a volumetric flask
D. use the above B and C

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Which of the following applications does not belong to the application range of fluorescence spectrophotometry?

A. Qualitative analysis of inorganic ions
B. Quantitative analysis of organic molecules
C. Gravimetric analysis
D. Biochemical analysis

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Errors caused by inconsistencies between the discoloration point of an indicator and the stoichiometric point are called ( )

A. random error
B. method error
C. terminal error
D. reagent error

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Which of the following applications does not belong to the application range of fluorescence spectrophotometry?

A. High sensitivity
B. High selectivity
C. Not susceptible to interference
D. Flexible

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