Sodium hydroxide solid can be used to prepare standard solutions.
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The acidity of HAc is stronger than that of H2CO3.
The conjugate base of HCN is CN–.
Which of the following methods can eliminate system errors?
A. Calibrate measuring instruments.
B. Improve measurement methods.
Change the test temperature.
D. Run a controlled experiment.
Which of the following statements about significant figures is incorrect?
A. Significant figure refers to the number that can be actually measured in the analysis work.
B. The number zero does not affect the number of significant figures.
C. Significant figures reflect the accuracy of the measurement.
D. The last digit of significant figures is suspicious.
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