ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS
AND ANSWERS A+ GRADED. BUY Quality Materials!
buoyancy correction
m=(m'(1-(air density/weight density)))/(1-(air density/object density))
Absorbance
-log(transmittance)
Relative uncertainty=
absolute uncertainty/magnitude of measurement
68% of measurements in a Gaussian Curve will lie
between the mean-1 and the mean+1
mean=
true value +-time*standard deviation
T-test Case 1
measure sample of known composition
T-test case 2
compare replicate measurement of an unknown sample
T-test case 3
compare individual difference of an unknown sample
- two sets of data analyzed by both methods being used
T-test case 1 equation
true value= mean (+-) (time*standard deviation)/sqrt(number of measurements))
T-test case 1 Tcalc=
(sqrt(n)Iknown value-calculated meanI)/standard deviation
For Case 1:
If Tcalc>Ttable
the actual value isn't in the range and it is bad
For Case 1:
If Tcalc<Ttable
the actual value is close to our calculated value
For Case 2:
you need to first solve for Fcalc=
(larger standard deviation)^2/(smaller standard deviation)^2
If Fcalc<Ftable, you should use
Case 2A
If Fcalc>Ftable, you should use
Case 2B
T-Test Case 2A: Tcalc=
(Icalculated mean 1-calculated mean 2I/spooled)sqrt((n1n2)/(n1+n2))
For Case 2A:
if Tcalc < Ttable, then
the two sets of data are statistically indistinguishable
For Case 2A:
spooled(standard deviation pooled)=
, sqrt((s1^2(n1-1)+s2^2(n2-1))/(n1+n2-2))
where s=standard deviation and n=number of measurements
For Case 2B:
Tcalc=
(Icalculated mean 1-calculated mean 2I)/sqrt((s1^2/n1)+(s2^2/n2))
For case 2B:
if Tcalc<Ttable, then
the two sets of data are indistinguishable
For Case 3:
Sd=
sqrt((sum of (difference-average difference)^2)/n-1)
For Case 3:
Tcalc=
(Iaverage differenceI/Sd)*sqrt(n)
Grubbs test
Gcalculated= Iquestionable value-calculated meanI/standard deviation
-calculated mean and standard deviation need to include the questionable point
Absorbance corrected for dilution=
Absorbance measured*(total volume/initial volume)
Energy=
Plancks constant*frequency
Planck's constant=
6.626x10^-34 Js
c=(in terms of energy and absorption)
wavelenght*frequency
E=
(planck's constant*c)/wavelength
Beer's Law Equation
Absorbance= constantdistanceconcentration
Transmittance Equation=
P/Po
Po= particular intensity at a specific wavelength
How do you solve polyprotic titrations for the zwitterionic form of the ion
you use our special tool to solve for [H3O+]
[H3O+] using the special tool equation:
=sqrt((K1K2[HL]+K1Kw)/(K1+[HL]
[H30+] simplified using the special tool equation:
=sqrt(K1K2)
pH using the special tool equation:
=0.5(pK1+pK2)
Finding the predominant species in monoprotic acids:
alpha HA=
[HA]/([HA]+[A-])
Finding the predominant species in monoprotic acids:
alpha A-=
[A-]/([HA]+[A-])
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 EFT, 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 this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller SUPERGRADES01. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R148,69. You're not tied to anything after your purchase.
