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When EDTA directly titrates nonferrous metal ions, the end point will take on the color ( ).
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Using phenolphthalein as the indicator, the solution of H3PO4 was neutralized at 10.00 mL with 0.1 mol/L NaOH solution ( ) mL.
Titrate the same volume of KMnO4 and NaOH at the same concentration of H2C2O4 standard solution. If the volume of solution consumed is the same at the stoichiometric point, it means that the concentration of NaOH solution is 5 times that of KMnO4 solution.
The main function of the atomizer is to convert the element to be measured in the sample into excited atoms.
In atomic absorption spectroscopy, the molecular absorption of the atomizer belongs to：
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