exp 4 Iron Flashcards
1
Q
what do we use slope to find?
A
E, molar absorptivity bc slope is E x b
2
Q
what is beers law?
A
A= E b c a is absorbance e is molar absorptivity, (L/mol x cm) b is path length or distance photons travel c is concentration (mol/L)
3
Q
when are more photons absorbed?
A
as concentration increases
if photons traverse a longer path length
if the absorption probability is high
4
Q
what does beers law show?
A
absorbance is linearly proportional to concentration of the absorbing entity
5
Q
variables in c1v1=c2v2
A
c1 is unknown or stock
v1 is from the pipet
c2 is from the equation of the line
v2 is from the volumetric flask
6
Q
how do we prep the iron?
A
need to reduce iron III to iron II
4 Fe3+ + 2 NHOH = 4 Fe 2+ + N2O + 4 H+ + H2O
7
Q
prep of calibration curve?
A
set spectrometer to max absorption wavelength
8
Q
solving for x?
A
x in y= mx + b is the concentration
9
Q
linear equation
A
eb= m
