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16. A blank sample in analytical chemistry is used to:

A. Calibrate the instrument baseline
B. Determine the concentration of the analyte
C. Test the sensitivity of the method
D. Measure precision
17. Which type of error is reduced by repeated measurements and averaging?
A. Systematic error
B. Random error
C. Gross error
D. Instrumental error
18. During quality assurance, what is the role of proficiency testing?
A. To train analysts
B. To compare a laboratory’s performance with others
C. To calibrate instruments
D. To write SOPs
19. A calibration standard should:
A. Be freshly prepared each time
B. Have a known, stable concentration
C. Contain impurities to test specificity
D. Be prepared from unknown samples
20. Which of these errors is the most difficult to detect and correct?
A. Random error
B. Systematic error
C. Gross error
D. Instrumental error

1 answer

Here are the answers to the questions based on analytical chemistry concepts:

  1. A blank sample in analytical chemistry is used to:
    A. Calibrate the instrument baseline
    A blank sample helps in establishing a baseline measurement by accounting for any background signal or interference.

  2. Which type of error is reduced by repeated measurements and averaging?
    B. Random error
    Random errors can be minimized through multiple measurements and averaging, leading to more precise results.

  3. During quality assurance, what is the role of proficiency testing?
    B. To compare a laboratory’s performance with others
    Proficiency testing provides a means of evaluating the performance of a laboratory by comparing its results with those of other laboratories.

  4. A calibration standard should:
    B. Have a known, stable concentration
    It is essential that calibration standards have a known concentration to ensure accuracy in measurements.

  5. Which of these errors is the most difficult to detect and correct?
    B. Systematic error
    Systematic errors are consistent and reproducible inaccuracies that are often difficult to identify and are typically more challenging to correct than random errors.