Analytical Chemistry Final- ACS Exam
2025 Questions and Answers
ppm - --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
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,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+...)
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, 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
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2025 Questions and Answers
ppm - --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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1
,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+...)
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2
, 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
....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 3
