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Home › Chemistry Help › NOTES FOR Keq ONLINE VIDEO: 1) DO NOT USE TUBE 5 for your...
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NOTES FOR Keq ONLINE VIDEO: 1) DO NOT USE TUBE 5 for your calculations; 2) Fe(NO3)3 concentration is 0.00400 M, not 0.00200 M; 3) Spectrasuite only measures odd wavelengths, but the protocol wants measurements at 447 nm. Just average the two wavelengths. LAB VIDEO: https://ufile.io/lrv4lppz

Date Posted: 06/10/2020
Category: Chemistry
Due Date: 08/10/2020
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  • Lab Write-ups should include the following: Purpose—What were you supposed to have learned from this lab? What were you trying to do in the lab? 1-2 sentences Observations & Data— You do not need to copy down the procedures from the lab manual, but for your observations you need to place them in context. For example: “It turned red” is not quite enough. “When the indicator was added to the 20 mL of vinegar, the solution turned red” is better. Often times the data/observations will go well in a table or graph. Calculations & Results— Some labs will require some mathematical manipulations. Make sure all of your steps are shown. If you have the same calculation repeated several times, you need only show the entire thing once, and then show just the rest of the results. SHOW ME WHAT YOU DID. (please, I beg) Post-Lab Questions —Answers to any post-lab questions in your lab notebook.
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  • "note that you aren't given a Keq or Kc value to solve for X. We determine X from our two experiments (Standard curve for equation and then absorbance of unknown to solve for equilibrium conc. of FeSCN). "X = [Fe(SCN)2+] and is to be determined from the standard curve. You can then calculate the equilibrium constant, Keq, using the equilibrium concentrations." pg 79. So whatever you get from table 2 (w/ initial Fe3+, SCN-, abs, and FeSCN2+) that last column is what you will put for change in the ICE table."
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  • "the lab instructions, so don't forget to do % error. It's like the last line on the last page, so it's very easy to miss. Compare your average Keq value to the literature value (138). Why do you think it's different?"
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