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Chem 7L Final

Question	Answer
%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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