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Ca2+ was precipitated into CaC2O4, then dissolved in acid, and then the H2C2O4 was titrated with KMnO4 standard solution, so as to determine the content of Ca. The titration method used belongs to ( )

A. direct titration
B. indirect titration method
C. precipitation titration
D. redox titration method

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Which of the following components is not part of the fluorescence spectrophotometer?

A. Light source
B. Excitation monochromator
C. Emission monochromator
D. Ion source

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The molar mass of a reference substance A is 500 g/mol, and it is used to calibrate the B solution of 0.1 mol/L. The calibration reaction is set as: A+2B==P, and the weighing quantity of the reference substance is ( )

A. 0.1 ~ 0.2 g
B. 0.2-0.5 g
C. 0.5 ~ 1.0 g
D. 1.0 ~ 1.6 g

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In order to maintain a good linear relationship between the fluorescence intensity of the solution and the concentration of the solution, you should:

A. Keep the absorbance of the solution less than 0.05
B. Keep the light transmittance of the solution greater than 0.5
C. Use monochromatic light as excitation light
D. Use cuvettes with longer optical path

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To prepare 1000 mL 0.1 mol/L HCl solution, the volume of concentrated hydrochloric acid (12 mol/L) should be ( ).

A. 0.84 mL
B. 8.4 mL
C. 1.2 mL
D. 12 mL

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Ca2+ was precipitated into CaC2O4, then dissolved in acid, and then the H2C2O4 was titrated with KMnO4 standard solution, so as to determine the content of Ca. The titration method used belongs to ( )

A. direct titration B. indirect titration method C. precipitation titration D. redox titration method

Which of the following components is not part of the fluorescence spectrophotometer?

The molar mass of a reference substance A is 500 g/mol, and it is used to calibrate the B solution of 0.1 mol/L. The calibration reaction is set as: A+2B==P, and the weighing quantity of the reference substance is ( )

In order to maintain a good linear relationship between the fluorescence intensity of the solution and the concentration of the solution, you should:

To prepare 1000 mL 0.1 mol/L HCl solution, the volume of concentrated hydrochloric acid (12 mol/L) should be ( ).

A. direct titration
B. indirect titration method
C. precipitation titration
D. redox titration method