Exam (elaborations)
Analytical Chemistry Final- ACS Exam 2022
- Course
- Institution
Analytical Chemistry Final- ACS Exam 2022
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller EvaTee. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82191 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now