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ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS 2024 $12.99   Add to cart

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ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS 2024

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ANALYTICAL CHEMISTRY FINAL- ACS EXAM QUESTIONS AND ANSWERS 2024

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  • September 11, 2024
  • 26
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • ANALYTICAL CHEMISTRY - ACS
  • ANALYTICAL CHEMISTRY - ACS
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ANALYTICAL CHEMISTRY FINAL- ACS EXAM

What else can we use to keep the complete half cell reaction neutral? -
ANSWERS-a semi-permeable membrane



What is one problem with the semi-permeable membranes? - ANSWERS-it cannot
be made to be 0% permeable to other cations or anions



A good semi-permeable membrane will have what type of K? - ANSWERS-the K
value will be very very small



What type of agent is used more in redox titrations as a titrant? - ANSWERS-an
oxidizing agent



What is the problem with using permanganate as a titrant in redox titrations? -
ANSWERS-it is not a primary standard



When doing a redox titration, are you able to find a point at 0 mL? - ANSWERS-no,
you cannot find a point because you don't truly know the [metal]



Doing a redox titration: - ANSWERS-1. Find the K value using the equation to find
K with half-cells

2. Find the equivalence point(same as with acid base titrations)

3. solve the ice tables (WATCH OUT FOR STOICHIOMETRY)

,4. Solve for E+ using the concentrations you got

5. Find Ecell by taking the E+ you found- E- of the reference electrode



chelate effect - ANSWERS-the ability of multidentate ligands to form more stable
metal complexes than those formed by similar monodentate ligands



masking agent - ANSWERS-a reagent that protects some component of the
analyte from reaction with the EDTA



common ion effect - ANSWERS-a salt will be less soluble if one of its constituent
ions is already present in the solution



Gravimetric factor - ANSWERS-(grams of substance in analyte)/(grams of product
formed)



what is an extraction? - ANSWERS-combine two immiscible phases (polar, non-
polar), agitate, and let the analyte partition



what is chromatography? - ANSWERS-combine two immiscible phases (polar, non-
polar), let analyte partition



what is the difference between an extraction and chromatography? - ANSWERS-
one of the phases is flowing in chromatography while the other phase is
stationary

, what is the principle of extraction? - ANSWERS-like dissolves like



Ka equation for chromatography - ANSWERS-[A]stationary phase/[A]moblie phase



In chromatography you want to have Ka and Kb - ANSWERS-not equal to each
other



Retention Factor Equation - ANSWERS-k=(tR-tM)/tM

tR is the distance between the peaks

tM is the distance from 0 to the first peak



Relative Retention - ANSWERS-alpha=k2/k1 or alpha=t'2/t'1

*the smallest it can be is 1 which is bad to get



Resolution(Efficiency) - ANSWERS-R=(tR1-tR2)/(0.5(w2+w1))

R must be greater than or equal to 0



Liquid Chromatography - ANSWERS-used for samples that are not volatile, like
dissolves like



Normal Phase in Liquid Chromatography - ANSWERS-a more polar stationary
phase and less polar mobile phase and is not used as often

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