CHM135 Lab 1 report sheet 4
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Experiment 1: Light, Matter and Measurements
Report Sheet
You are welcome to seek guidance on the content of this lab report from your TA during your lab session and from the CHM135 lab coordinator during lab office hours. You are also welcome to work constructively with your peers on the general content and understanding of the material. However, the work submitted here in this report sheet must be your own. For more details on academic integrity and potential penalties see the Code of Behaviour on Academic Matters
.
I certify that this submitted laboratory report represents entirely my own efforts. I have read and understand the University of Toronto policies regarding, and sanctions for, academic honesty.
I regret that I violated the Code of Behaviour on this assessment and would like to admit that now so that I can take responsibility for my mistake.
1.
What colours did you observe for each of the following salts? NaCl
SrCl
2
KCl
CuCl
2
2.
What did you observe on the black paper on the other side of the cuvette when you passed the green laser beam through the concentrated
solutions of green and red solutions? Explain your observations in one sentence.
Observation
Green solution
Red solution
3.
How did changing the concentration of the two dye solutions affect the amount of green laser light that was able to pass through the solution? What was the effect of adding move cuvettes in series? Explain your observations on the molecular level in one sentence.
a.
Green solution
b.
Red solution
4.
In lab, you observed atomic emission and molecular fluorescence, both of which involve photon emission. Compare these two processes – 1. How were the atoms/molecules excited in each case? 2. How did the energy of the emitted photon compare to the energy of the excitation process in each case? Why?
Fluorescence:
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Not Secure - a5.chem.binghamton.edu o
E LON-CAPA t30p04a
O [엘소드/KR Elswrod] 범…
MC Kimetsu no Yaiba - Di.
As you work on the questions, have your lab manual and text book handy.
If you have questions go to one of the office hours and remember, do not leave it for the last
minute!
In the titration of 25.00 mL of a water sample, it took 19.090 mL of 3.165x 10-3 M EDTA solution to reach the
endpoint.
Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant
figures)
6.04x10-5
You are correct.
Your receipt no. is 151-9969 ?
Previous Tries
The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express
this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+
present in the bottled water sample titrated. (enter your answer with 3 significant figures)
6.04x10-5
You are…
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You perform the conductivity experiment as described in the lab manual using NaCl solutions of known concentrations. You plot the conductivity of your solutions (μS/m) as a function of the concentration (mol/L). You make a trendline with an equation of y = 1.42 x 105 x + 9.94 x 102. You then test the conductivity of an unknown sample of chicken broth. If the chicken broth conductivity is 7.12 x 103 μS/m. What is the concentration of NaCl in the broth in mol/L?
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