Written by Lisa Abstract Bromothymol blue is an indicator used to detect weak acids and bases. In acidic solutions, it appears yellow, in basic solutions it is blue, and in mid pH ranges, it is green. By determining the absorbance values of solutions at all of these extremes, the equilibrium constant (Kc) of this indicator can be calculated. After taking the spectra of each the yellow, the blue and the green solutions, a Kc value of (1.2 ± 0.19) M and […]
Written by Alex Discussion: In this lab, both column chromatography and TLC chromotography were used to separate a mixture of fluorine and 9-fluroenone and detect their separation. In the first part of the experiment, a proper solvent was experimentally found. Through process of elimination, the best solvent for the flourene/fluroenone mixture was found one at a time by performing a TLC chromatography with each solvent. This is done by spotting a TLC plate on a line penciled in 1cm from […]
Written by Javon Results and Discussion The results were obtained by the collaborators who performed the experiment. Figure 1: c/N vs c Table 1: c/N vs c c c/N 0.00342342 3.00598832 0.01837836 15.831308 0.04160156 22.6250274 0.06804798 30.7722158 0.09537528 38.5146221 0.12260248 4.45704831 Using the equation c/N = c/Nm + 1/kNm, Nm (number of moles of acetic acid required to forma monolayer onto the charcoal) can be approximated as the inverse of the slope of the best fit line. The […]
Written by Johanna ABSTRACT: This experiment effectively determined the differences between Iron (II) and Ruthenium (II) Tris-2,2’-bipyridine complexes through the comparison of absorption and emission spectroscopy and cyclic voltammetry. In both the UV/Vis absorption and emission spectra, the Ru (II) complex shows far greater molar absorptivity values and fluorescence. The iron complex does not fluoresce. The MLCT peaks in the UV/Vis spectra correspond to the energy of the t2g à t2g* or HOMO à LUMO transitions, 2.64 x 105 J/mol […]
Written by Jimmy Table of 1H NMR Spectral Data of Ketal ester Table of 13C NMR Spectral Data of Ketal ester Table of IR Spectral Data of Ketal ester Provide your experimental index of refraction and correction factor: 1.4229 @ 22ºC 1.4229+0.00045*2=1.4238 Literature=1.4377 Reproduce your Theoretical and Percent Yield Calculations. Ethyl Acetoacetate: 10.0 mL (1.029g/mL) (1/130.14g/mol) = 0.0791 mol Glycol: 4.5 mL (1.113g/mL) (1/62.07g/mol) = 0.0807 mol 1:1 ratio of prods to reacts and reacts […]
Written by Hannah Purpose To measure the grams of yellow 5 dye in a sample (i.e. bottle of Minute Maid Lemonade), and to identify the cations present in sparklers using their emission spectra (Spectroscopy). Procedure Six standard solutions were made from the Yellow 6 stock solution. The first standard solution was made by adding 5.00 mL 6.550×10-5 M yellow 6 solution and 2.00 mL of distilled water to a test tube using a graduated pipet and by subsequently mixing […]
