Name and ID Number:Roberta JoEdwards
Total Points = 60 pts (5 pts notebook, 55 pts template)
Upon successful completion of the above information, its time to break out the software and graph it! This will be then using a spe
DATA, GRAPHS AND CALCULATIONS
Creating the calibration curve:
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
What measurements will be made? [Do not provide experimental details here].
How do you go from
calculated/measured values to accomplishing stated purpose?
To put this is a simple way, the overall purpose of this lab is to prepare a series of standard solutions from one stock solution, and
then use these standard solutions to plot a calibration curve. To do this, we must first obtain the stock solution of
6.25E-4 M of
Ferroin solution. We then, using a volumetric flask, dilute the stock solution to the standard amount we desire (these amounts are
found in pre-lab #2).
The calculations for that are:
moles of Ferroin
Moles of Ferroin *
mL of stock solution
moles Stock solution * 1L
After that has been accomplished (and we should have 5 total standard solutions), we must then move on to preparing an iron
sample to plot too. Remember, the iron tablet has been crushed into a powder! The overall goal in this part of the lab is to dilute the
tablet, so that we might (after the lab is done) be able to calculate how much of the tablet was just Iron, and how much of it was the
whole tablet. We do this by weighing
out ~25mg of iron tablet powder. We then put it in a mix of 2mL of 0.1M Hcl, and heat it. Once
that is completed, we will then transfer it (via syringe) to a volumetric flask. Make sure to get all the Iron tablet out! Add water to the
mark on the flask, and stir well,
U will then transfer 5mL to a new volumetric flask, where you will be adding to it hydroxylamine
hydrochloride (which allows the Fe 2+ to react and become Fe3+), sodium acetate (which will neutralize any excess acid left over),
and 1, 10-phenanthroline.
Upon successful completion of the above information, its time to break out the software and graph it! This will be then using a
spectrophotometer/computer station that is provided in the lab. Basically, you put the standard solutions (in order) into the said area,
and the computer graphs it. You study it, and write down the information( later on, when your trying to find the concentration of the
Ferroin complex, you can plot your data, and use Abs=slop * [Ferroin] + y-intercept to find the concentration). When all it said and