Which of the following statement about αY(H) is correct
A. αY(H) decreases as pH decreases
B. αY(H) increases as pH increases
C. At high pH, αY(H) is approximately equal to 0
D. αY(H) increases with increasing solution acidity
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Under normal circumstances, the complexation ratio of EDTA to the metal ion complex is ( )
A. 1:1
B. 1:2
C. 1:3
D. 2:1
1. In titration analysis, the sudden change of indicator color is generally used to determine the arrival of stoichiometric point, and the titration is stopped when the indicator changes color.This point is called ( ).
A. titration analysis
B. titration
C. stoichiometric point
D. endpoint of titration
Which of the following statements is not true?( )
A. The content of any substance capable of redox reaction can be determined by a direct method
B. Acid-base titration is a kind of titration analysis method based on proton transfer reaction
C. Rapid reaction rate is one of the important conditions for titration analysis
D. Chemical reactions suitable for direct titration must be quantitative
The correct description about the molecular ion peak is ( ).
A. The mass-to-charge ratio of the molecular ion peak is equal to the relative molecular mass of the compound
B. The peak with the largest mass is the molecular ion peak
C. The second highest mass peak is the molecular ion peak
D. The most intense peak is the molecular ion peak
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