{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

lab 6

# lab 6 - Fe(NO 3 3 KSCN↔Fe(SCN 2 and used a spectrometer...

This preview shows page 1. Sign up to view the full content.

Elizabeth Farrington Experiment 6 Discussion The purpose of this lab was to learn how to use a spectrometer. We learned to measure concentrations of ions and to determine the equilibrium constant of Fe 3+ +SCN - ↔Fe(SCN) 2+ at a given temperature. For Part I we measured the absorption of a series of solutions of Fe(NO 3 ) 3 +KSCN↔Fe(SCN) 2+ using a spectrometer. From the absorption we calculated the concentration of Fe(SCN) 2+ . For A-1 it was 0, for A-2 it was 2*10 -5 , A-3=4*10 -5 , A-4=8*10 -5 , A-5=1.2*10 -4 , A- 6=1.6*10 -4 , A-7=2*10 -4 . We graphed the absorbance versus the concentration to find an equation for the calibration curve. For Part II we made solutions of
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Fe(NO 3 ) 3 +KSCN↔Fe(SCN) 2+ and used a spectrometer to measure the absorptions. From the equation in part I we found the concentrations of Fe(SCN) 2+ . For B-1 through B-5 respectively: 2.16*10-6 , 4.12*10-5 , 1.16*10-4 , 2.16*10-4 , 2.87*10-4 . K=[ Fe(SCN) 2+ ]/([ KSCN][ Fe(NO 3 ) 3 ]) Some possible errors would be letting the solution sit in the spectrometer so long that the light starts to affect the solution, or not being careful enough about fingerprints. I learned to use a spectrometer to measure. Next time I will work quicker to get the answers to avoid another time specific error....
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern