Analytical Chemistry Final- ACS Exam (2022 Questions & Answers
19. buoyancy correction: m=(m'(1-(air density/weight density)))/(1-(air
densi- ty/object density))
20. accuracy: closeness of the mean to the "true value"
21. precision: reproducibility of individual measurements
22. Uncertainty in Addition/Subraction: e=sqrt(ex1^2+ex2^2+ex3^2+...)
23. Uncertainty in
Multiplication/Division: e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+(ex3/x3)^2+...)
24. Significant Figures in Logarithms and antilogarithms: the number
of sig- nificant figures in the log should equal the number of digits in the
mantissa
25. How many significant figures in log(205.5): four significant figures,
so you will need four decimal places in your answer
26. pH: -log[H3O+]
27. [H3O+]: 10^-pH
28. Absorbance: -log(transmittance)
29. Random Error: -repeated measurements are sometimes high and
sometimes low
-cannot be corrected for
30. Systematic Error: -repeated measurements are usually always high or
always low
-can and should be corrected for
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