Analytical Chemistry Final- ACS Exam Questions and Answers (Already Graded A+)

Analytical Chemistry Final- ACS Exam
Questions and Answers (Already Graded
A+)
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

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+...)


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

For Case 2:
you need to first solve for Fcalc= - ANSWER-(larger standard deviation)^2/(smaller
standard deviation)^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