Spec. Determination of Mn Informal Report - Davis Rhett...

This preview shows page 1 - 3 out of 3 pages.

Davis Rhett Davis Gen. Chem II L Dr. Longo Lab Partner: Christine Callahan July 9, 2015 Spectrophotometric Determination of Manganese Data Table 1. Absorption vs. Wavelength for Maximum Absorbance Determination Wavelength (nm) Absorbance 400 .496 410 .452 420 .416 430 .397 440 .370 450 .366 460 .381 470 .445 480 .548 490 .637 500 .803 510 .862 520 1.036 530 .985 540 .986 550 .873 560 .609 570 .532 580 .276 590 .152 600 .124 610 .107 620 .099 630 .089 640 .081 Wavelength of Maximum Absorbance = ________520 ____nm
Davis This was decided as the wavelength of maximum absorbance because this is the wavelength which yielded the greatest absorbance. 400 450 500 550 600 650 0 0.2 0.4 0.6 0.8 1 1.2 Absorbance vs. Wavelength Wavelength (nm) Absorbance Data Table 2. Standard solutions Initial buret reading (mL) Final buret reading (mL) Volume added (mL) Standard #1 1.00 11.01 10.01 Standard #2 11.01 30.98 19.97 Standard #3 1.28 31.00 29.72 Standard #4 1.42 41.11 39.69 Data Table 3. Unknown Number = ___104 _______ Wavelength = _____520 _nm _______ Standard solutions Concentration of KMnO 4 (M) Absorbance Standard #1 2.968 x 10 -5 .075 Standard #2

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture