multiple techniques to complete and verify the bromination of trans-stilbene. First technique we used was to reflux the mixture; this contains having the mixture boiling so it will evaporate while the condenser will recondense the solvent which is boiling off so the solvent may stay in the reaction. Next we used the melting point of the product to verify which product was produced along with the purity of the compound. Lastly we did a flame test using copper which will change to a green-blue flame in
Premium Distillation Acetic acid Oxygen
compound. In this experimented benzoic acid was crystallize using ethanol and water. I chose these solvents based on part C of the experiment (table 1.1). The compound is too soluble in ethanol but too insoluble in water. Benzoic acid is a polar compound in comparison with ethanol which is a less polar compound. However at low temperatures benzoic acid is insoluble in water. Compounds are soluble in solvents with the same polarity‚ like dissolves like. Table 1.1 Benzoic Acid solubility Dissolve Heat
Premium Solubility Solvent
Answers to Questions 1. For solutes that are dissolved because of intermolecular attractions with the solvent‚ state the intermolecular attractions involved. Intermolecular Attractions F There are dipole-dipole attractions and hydrogen bonding between polar acetone and polar water. J There are dipole-dipole attractions and hydrogen bonding between ethanol and water. There are also dipole-dipole attractions between ethanol and diethyl ether. L There are hydrogen bonding‚ dipole-induced
Free Solvent Oxygen Ethanol
N-(tert-butyl)carbamate (4a). Next‚ in order to improve the yield of 4a‚ the effects of different solvents‚ reaction temperatures and times together with the molar ratio of the reactants were examined in this model reaction‚ for which the reaction conditions would be optimized. When this reaction was performed in refluxing EtOH‚ 7a was obtained
Premium Oxygen Chemistry Solvent
random packing or structured packing. CO2 containing gas flows upwards and the absorption liquid flows downwards. The solvent (rich amine) is pumped further through a heat exchanger to a separation column. The absorbed CO2 is regenerated in a separation (stripper) column. Heat is added to the reboiler and a condenser supplies reflux to the column. After the separator‚ the regenerated solvent (lean amine) is recirculated back to the absorption column and cooled in a heat exchanger and a cooler. The simplest
Premium Solvent Distillation Chemistry
m-aminobenzoic acid and the 1-chloro-2‚4-dinitrobenzene‚ were mixed together and were dissolved using dimethylformamide. The resultant solution was heated‚ mixed with deionized H2O and vacuum filtrated in order to separate our formed product form the solvent. This technique was further repeated after our product was washed with heated ethanol. The final product was m-(2‚4-dinitroanilino) benzoic acid. The reaction mechanism for the overall reaction in question is as follows: Results & Observations:
Premium Benzene Solvent Organic reaction
the melting point of tin tetraiodide. Tin tetraiodide was recrystallized after the synthesis. The percent yield and the theoretical yield of tin tetraiodide were calculated. Recrystallization is to further improve the purity of tin tetraiodide. The solvent is carefully chosen to be toluene in order to maximize the recovery of tin tetraiodide during recrystallization. Experimental method1 Approximately 2.50g iodide and 1.01g tin were weighed on a balance and were placed in an Erlenmeyer flask. Approximately
Premium Solubility Stoichiometry Yield
organic base purine derivatives.1 By studying the infrared data for the boinding of insoine to the metal atom‚ the interactions between the purine derivative and metal can be studied. Experimental: All reagents and solvents used were purchased from commercial suppliers. All solvents and reagents used in this experiment were used as received. To obtain IR spectra‚ Thermo Scientific Nicolet IR100 FT-IR spectrometer was used. General Procedure 1: Preparation of trans-[Bis(inosato)palladium(II)]¹
Premium Metal Solvent Infrared
recrystallize the caffeine. The solvents used in the experiment were an aqueous sodium carbonate and dichloromethane (DCM). Anhydrous calcium chloride pellets were used to dry the solution and emulsion layer and the DCM was then decanted. After washing the anhydrous calcium chloride pellets with more DCM‚ the solvent was evaporated‚ leaving greenish-white crystalline caffeine residue weighing about .25 mg. In order to recrystallize the caffeine‚ we used a mixed-solvent method‚ consisting of hot acetone
Premium Solvent Chemistry Tea
Abstract: Caffeine‚ (C8 H10 N4 O2) a white‚ crystalline alkaloid known as a nervous system stimulant found commonly in tea leaves and coffee‚ can be extracted using the method of sublimation with the use of Methylene Chloride (CH2Cl2) and Sodium Hydroxide; both can repeatedly rinse the green (unroasted) coffee beans from the caffeine. Keywords: Caffeine‚ Methylene Chloride‚ Sodium Hydroxide‚ Anhydrous Sodium Sulfate I. Introduction Caffeine is an alkaloid of the methylxanthine family. Its chemical
Premium Caffeine Solubility Solvent