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Analytical Chemistry Final- ACS Exam 2022
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Analytical Chemistry Final- ACS Exam 2022
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Analytical Chemistry Final- ACS Exam 2022ppm - Answer (grams analyte/grams sample)x10^6
Molarity - Answer moles analyte/liter of solution
Volume Percent - Answer (volume solute/volume soution)x100
Volume ppm - Answer (volume solute/volume solution)x10^6
kilo- - Answer 10^3
deci- - Answer 10^-1
centi- - Answer 10^-2
milli- - Answer 10^-3
micro- - Answer 10^-6
nano- - Answer 10^-9
pico- - Answer 10^-12
femto- - Answer 10^-15
weight percent - Answer (grams analyte/grams sample)x100
ppt - Answer (grams analyte/grams sample)x10^3
ppt simplified - Answer gram analyte/liter solution
ppm simplified - Answer mg analyte/liter solution
ppb simplified - Answer micrograms analyte/liter solution
pptr simplified - Answer nanograms analyte/liter solution
buoyancy correction - Answer m=(m'(1-(air density/weight density)))/(1-(air density/object density))
accuracy - Answer closeness of the mean to the "true value"
precision - Answer reproducibility of individual measurements
Uncertainty in Addition/Subraction - Answer e=sqrt(ex1^2+ex2^2+ex3^2+...)
Uncertainty in Multiplication/Division - Answer e=y*sqrt((ex1/x1)^2+(ex2/x2)^2+
(ex3/x3)^2+...) Analytical Chemistry Final- ACS Exam 2022
Significant Figures in Logarithms and antilogarithms - Answer the number of significant figures in the log should equal the number of digits in the mantissa
How many significant figures in log(205.5) - Answer four significant figures, so you will need four decimal places in your answer
pH - Answer -log[H3O+]
[H3O+] - Answer 10^-pH
Absorbance - Answer -log(transmittance)
Random Error - Answer -repeated measurements are sometimes high and sometimes low
-cannot be corrected for
Systematic Error - Answer -repeated measurements are usually always high or always low
-can and should be corrected for
Relative uncertainty= - Answer absolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie - Answer between the mean-1 and the mean+1
Variance in standard deviation - Answer standard deviation squared
mean= - Answer true value +-time*standard deviation
T-test Case 1 - Answer measure sample of known composition
T-test case 2 - Answer compare replicate measurement of an unknown sample
T-test case 3 - Answer compare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
T-test case 1 equation - Answer true value= mean (+-) (time*standard deviation)/sqrt(number of measurements))
T-test case 1 Tcalc= - Answer (sqrt(n)Iknown value-calculated meanI)/standard deviation
For Case 1: If Tcalc>Ttable - Answer the actual value isn't in the range and it is bad
For Case 1: If Tcalc<Ttable - Answer the actual value is close to our calculated value
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