The Equilibrium Constant for Bromothymol Blue: A General Chemistry Laboratory Experiment Using Spectroscopy

Abstract

W e describe an update to a traditional "determination of a pK a " experiment, typically taught in general chemistry

Kinetic and thermodynamic studies for alizarin removal from liquid phase using poly-2-hydroxyethyl methacrylate (PHEMA)

“…48 Several remediation techniques for the removal of organic impuri-49 ties from polluted water such as electrochemical oxidation [6][7][8][9][10][11][12][13][14][15][16][17][18], sorp-50 tion, chemical coagulation, solvent extraction, bioremediation, photo 51 catalytic degradation and adsorption were reported, with varying levels 52 of success achieved and each technique also characterized by its inher- 53 ent limitations. Among all the chemical and physical methods available 54 for noxious dye removal from polluted water, adsorption has been rec- 55 ognized as an attractive severance technique for the removal of dyes 56 from wastewater, because it is highly efficient, a Q7 relatively low-cost 57 technique and has a simple design [19]. Several previously developed 58 adsorbents such as carbon nanotubes [20][21][22][23][24][25][26][27], MWCNTs [28,29], nano- 59 particles and nanocomposites [30][31][32], rubber tire [33,34], and other 60 low cost adsorbents [35][36][37][38][39][40], have been extensively used for instanta- 61 neous elimination and maximum adsorption of dyes and other noxious 62 impurities.…”

“…The amount of alizarin removal was calculated using the following 134 formula [57][58][59][60]: may also be at play [68]. According to the above results, a pH of 8 was where Q e , Q t and k 1 are the amount of dye adsorbed at equilibrium (mg/g), the amount of dye adsorbed at time t (mg/g) and the equilib- Linear form of pseudo-second order model was illustrated as:…”

A bottom-up approach to construct or deconstruct a fluid instability

“…The C.I. shows a yellow color for pH values below 6 (acidic state), green color for pH between 6–7 (neutral state), and a blue color for pH values above 7 (basic state) 12 . The reagent concentrations in solution A used for all experiments are: PAA 0.438 wt%, 0.068 M SO 3 2− , 0.021 wt% C.I.…”

Saturated adsorption of lidocaine and coal tar dyes onto porous polytetrafluoroethylene

“…31 Similarly, the adsorbed BTB, CBB, FC, R6G, and MG of the reectance maxima can be observed at 428, 662, 540, 540, and 661 nm, respectively. [32][33][34] Because the wavelength of the reection peak of the adsorbed dye approximately matches the absorption wavelength of the dye, the dye did not decompose during the adsorption process.…”