Amie Marston
Section: BV
Lab Partner: Chris Lyles
Total Points = 60 pts (5 pts notebook, 55 pts template)
DATA, GRAPHS AND CALCULATIONS
1 pt
Creating the calibration curve:
Ferroin:
Concentration (M)
Absorbance
1.25E05
0.180
2.50E05
0.470
2 pts
3.75E05
0.730
5.00E05
1.000
6.25E05
1.300
Purpose and Method
Clearly state the purpose of this part of the lab.
Explain how this is accomplished in this experiment. What calculations do you need
to perform?
What measurements will be made? [Do not provide experimental details here].
How do you go from
calculated/measured values to accomplishing stated purpose?
(
10 pts
)
Purpose: To determine the concentration of an unknown solution. To do this we will also prepare standard solutions of varying
molarity.
Method: We will take a stock solution and dilute it to specific concentrations. We will then use these solutions to generate a
calibration curve in order to identify the concentration of the unknown. The concentration will be measured against the known mg in
the iron tablet used.
The equation to find the moles in standard solution is: ml needed (10 in our experiment) * 1L/1000ml * moles solution/1L = M
The equation for diluting the stock solution is: moles solution * 1L/moles solution * 1000ml solution/1L = ml of __ M solution
To measure absorbancy the equation is y=mx+b where y=absorbancy, m=slope, x=concentration and y=intercept
λ
max
=
508.42
nm
This was the nm reading of our unknown ferroin solution. Not sure if that's
what the question was asking.
Experiment 2
: Calibration Curves and an Application of Beer's Law
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calculations and responses other than the reporting of raw data are your own independent work. Failure to sign this declaration will cost
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 Spring '08
 Chiu
 Chemistry, calibration curve, Iron supplements

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