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The radiation sources used in atomic absorption spectrometry (AAS) are usually element-specific.

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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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