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The coordination numbers of [Cu(NH3)4]2+and[Cu(en)2]2+ are both 4.

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If the stability of the complex formed by the indicator and M is slightly less than that of the corresponding EDTA complex, the end point will be delayed, which belongs to the fossilization of the indicator.

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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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