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Chem 7L Final

QuestionAnswer
%Error accuracy
% RSD precision
accuracy close to true value
precision reproducibility
systematic error shifts in one direction, accuracy, instrumental, method, personal
random error scattered, precision, both directions
gross error human error
n sample population
N population
% RSD < 1 great precision
% RSD 1-3 good precision
% RSD > 3 low precision
sig figs of st. dev. 1 sig fig unless starting with 1 or 2, can't be more precise than instrument error
sig figs for log(x) sig figs= sig figs after decimal
bidentate= 2 electrons
analytical chemistry analysis of samples
analyte substance of interest
Hhq^+ pH below 5, soluble, doesn't bind
hq pH 5-10, binds, insoluble
hq^- pH>10, soluble and bind, forms by products
buffer for experiment 2 ammonium acetate
what does the buffer do in experiment 2 maintain pH overnight
what does HCl do in experiment 2 raise the pH
equivalence point moles analyte=moles titrant
indicator of experiment 3 phenophathein
analyte of experiment 3 unknown acid
endpoint color change
titrant NaOH
ligand in experiment 4 Oxalate
shielding reduces energy, reduces pull
degenerate s- and p-orbitals have same energy
reaction to form Al(hq)3 acid-base reaction
what pH is the experiment performed under and why 5, protonation stages are soluble, binds, and no by-products
why is the spectrophotometry ran at 520 nm cause green is complementary to red
Transmittance light gone through
absorbance -log(T)
what is to spectroscope calibrated with Hg (Mercury)
parallel spin same spin
anti-parallel spin opposite spin
parallel vs anti-parallel spins energy is lower for parallel spin
Created by: rstefanidis
 

 



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