Answers by visitors named: Suzy
I had to take cereal crush it up and place it in a crucible and cook it tell it was black ash. Then I took that burnt ceral and placed it into a beaker with HCL and water and boiled it tell the cereal was like a liquid cause coming out of the crucible it...
17 years ago
and phenanthroline and distilled water all this was put into those flasks before my iron solution the professor wanted us to do this so we could see the wavelength on the spectrometer
17 years ago
Can I send you my methods part again I wrote some more in there then you can see if I did it right Please :)
17 years ago
The starting materials for this lab were: a crucible, breakfast cereal (Kix), bun cent burner, 100 mL beaker, hot plate, 100 mL volumetric flask and stopper, a funnel and filter paper. First off by taking the breakfast cereal crushed up and placing it int...
17 years ago
Obtaining a 100 mL flask, it was place under the funnel and the liquid of cereal and hydrochloric acid was filtered out into the flask and a stopper was put on the top. The 100 mL volumetric flask with the colorless iron solution was fitted with a rubber...
17 years ago
The 250 mL volumetric flask was filled with 10 mL of sodium acetate by a graduated cylinder, 1 mL of hydroxylamine hydrochloride by a micro liter pipette and 10 mL phenanthroline by a graduated cylinder. Then the volumetric flask was not to the mark so, t...
17 years ago
Five volumetric flasks labeled 100-500 mL were filled with sodium acetate, hydroxylamine hydrochloride, and phenanthroline and distilled water and filled to the mark on the volumetric flask. These solutions were placed one after another into the cuvet to...
17 years ago
After testing the five solutions in the volumetic flasks, the next step was to take the iron phenanthroline solution in the volumetric flask when it was ready to be inserted into an Ocean Optics USB2000+ Miniature Fiber Optic Spectrometer.
17 years ago
First the cuvet had to be filled with distilled water and was placed into the spectrometer and set closest to zero, the spectrometer was set for about .077, and then the volumetric flask with the solution of iron-phenanthroline was tested in the cuvet at...
17 years ago
and the 0.077 was set to that because that was the lowest number I could get on spectrometer... that's why in the discussion part it said that is why there might be some error.
17 years ago
It is still placed into the methods part
17 years ago
Another reason why the iron sample percentage didn’t match up with the box of cereals iron content may be because during the process of transferring the burned cereal to the HCL beaker some of the cereal may have been still left in the crucible. In figure...
17 years ago
Dr. Bob can you help me get a concluding sentence to my discussion please
17 years ago
Phenanthroline (C12H8N2) was added to the colorless prepared solution and a phenanthroline-iron (II) complex was formed. The absorbance of the resulting colored solution was measured on the spectrophotometer and the percent iron was read from a graph that...
17 years ago
thank you. :)
16 years ago
2) d 3)a 4)b 5)c 6)a
15 years ago
so is it b for # 5?
15 years ago
never mind its d
15 years ago
thank you everyone for the help. I've been researching on the computer for months with no luck. i will look at the sites u recommended. i thought i was taking medical billing not a writing class....
14 years ago
B. The text says in 1945, the US emerged as a global superpower, a giant in world trade, and the recognized leader of the noncommunist world. C. Because of the presidents constitutional authority as a chief diplomat & military commander & the special dema...
12 years ago
Could you please expalin how you got this answer?
12 years ago
72, Thank you!
12 years ago
Thank you!
12 years ago
Are my answers correct?
12 years ago
Thank You Very Much
12 years ago
alright, I will. Thanks
12 years ago
I know it's 125/27 but I need it with a whole number and a fraction
11 years ago
Ummm I actually do noe but I just wanted to make sure. Plus I've finished my work already .
11 years ago
Yes we did ran an experiment for this but I was confused as to how I could find the stock solution absorbance. Here's the data I had obtained: - Unknown solution absorbance: 0.271 - Kool-Aid flavor: Cherry - Wavelength = 470nm - Mass of mix 1 transferred...
10 years ago
And the net weight for that is 3.6g (I'm not sure how to use it)
10 years ago
I wanted to get that graph but I didn't know how to find the concentration. Only way I can plot it is using concentration and absorbance
10 years ago
Well i have the dilution (mL/100mL) and absorbance. So to get concentration do I take the dilution and divide it by the volume of stock solution I used?
10 years ago
THANK YOU SO MUCH!!!
10 years ago
I did but there wasn't any pacific website that were helpful could you pleas give me some website that would help me answer my question
10 years ago
Thank you sooooooooooooooooooooooooooooooooooooooooo much Ms. Sue
10 years ago
This helps alot
10 years ago
I agree with Skylar. Answers above are wrong. Correct ones are BDCA
10 years ago
A would be the answer. Just look them up on google translate or the spanish dictionary. :)
9 years ago
Awesome, thank you! :)
9 years ago
Thank you this helped so much!
9 years ago
7.32
9 years ago
18*3.14=56.52 56.52÷4.5=12.56 13 strands Hwa needs 13 strands to surround the patio edge.
8 years ago
I think it will be Love because love is broken!
6 years ago
This lesson is optional so i assumed it's Science!
6 years ago
You are correct, right Ms. Sue?
6 years ago
Or an better way to write it, Lacey is 47 +5 ----- 52. Or you can look up the word problem on google matter of Fact you can just add the numbers!
6 years ago
Oh that is Sweet!
6 years ago
128.6km
4 years ago