Benzamide, CaHsCONH2 1. is an amino acid 2. can be converted to phenylamine (aniline) on warming with bromine and concentrated aqueous sodium hydroxide. 4. On hydrolysis with mineral acid forms benzoic pheny(methanoic) acid.
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- In extraction of caffeine from tea, CaCO3 (pKa of HCO3- is 10.3) is used to convert tannin to glucose and calcium salt of gallic acid. Explain why glucose is not in its salt form but gallic acid is. Assuming pKa of -OH of glucose is 12, and pKa of -OH of gallic acid is 9.5 and pKa of -COOH of gallic acid is 4.5.Khaira performed the synthesis of ester X. Liquid-liquid extraction is needed to extract compound X fromthe aqueous reaction mixture. Given the solubility of ester X in the following solvents. Solvent Solubility of Compound X (g/mL solvent) at 25°C water 0.278 ethanol 1.027 acetone 1.309 dichloromethane 0.891 diethyl ether 0.759 a. Which solvent must she use to extract compound X? b. Calculate the KD. c. She transferred all of the aqueous reaction mixture in a separatory funnel, and she added 100 mL of theBEST solvent (from question a). If the total volume of the reaction mixture is 100 mL, calculate the g ofcompound X that will be extracted. (Based on literature; 5.0 g of the product will be synthesized from theamount of starting material she used.) d. Her partner, Jane, repeated the same experiment but this time, she performed the liquid-liquid extraction twiceusing 50 mL of the BEST solvent (from question a). Calculate the g of compound X that will be…For the determination of Pb in blood, a 5.00 mL sample was treated with trichloroacetic acid to precipitate the proteins. After centrifugation, the resulting solution was brought to pH 3 and extracted with two 5 mL portions of methyl isobutyl ketone containing the lead complexing agent APCD (ammonium 1-pyrrolidine carbodithiolate). The extract was drawn directly into an air-acetylene flame which produced an absorbance of 0.444 at 283.3 nm. Two 5.00 mL aliquots of solutions containing 0.250 and 0.450 ppm of Pb were subjected to the same sample treatment and the absorbance that occurred was 0.396 and 0.599 respectively. Calculate the concentration of Pb in µg/dL in the blood.
- An amino acid mixture of phenylalanine, glycine and glutamic acid is to be separated bypaper chromatography. The solvent is less polar than water. Which of these amino acids will have the highest Rf value and which the lowest? Explain. Treatment of a new protein with dansyl chloride reveals two (2) dansyl-labelled derivatives of amino acids, alanine and methionine. What can you deduce about the structure of the protein from these results? Name the amino acids that contribute atoms to both purine and pyrimidine rings.2.1g of sample are dissolved in methylene chloride and the sample is extracted with an aqueous solution of acid and base. Three compounds are isolated - 0.7g of ethyl p-aminobenzoate, 0.6 g of acetanilide, and 0.5 g of benzoic acid. Calculate the % composition of ethyl p-aminobenzoate in the recovered mixture. (Round the answer to 1 significant figure. Give just the number, not a % sign.)If I am doing an experiment on human H295R cells where I would treat the with very low concentrations of both Atrazine and DMSO. I have the cell culture media and the DMSO but I need to make a (9ppm Atrazine, DMSO) by dissolving powdered atrazine in DMSO. 1. If I have 0.04 g of Atrazine left in the bottle, how much (9ppm Atrazine, DMSO) solution can Imake? 2. How much atrazine stock willl I need to make 15.5ml of treatment solution (3ppb ATZ, cell culture media)? 3. What would be best for me to meausre the stock ATZ and what would be best for me to measure the cell culture media? 4. And then how much DMSO would I need to add to my 15.5 ml control solution?
- When BF3 behaves as a Lewis acid, the stability of the adducts with (CH3)2O, (CH3)2S, and (CH3)2Se decreases in the order in which the Lewis bases are listed. However, when the Lewis acid is B(CH3)3, the most stable adduct is that formed with (CH3)2S and the adducts with (CH3)2Se ad (CH3)2O are about equally stable. Explain the difference in stability of the adductsIn preparation of p-Nitroaniline, Starting material is 50g of p-nitroacetanilide, 22ml of HCI, 20g of p-nitroaniline. Give % yield of nitro acetanilide. What is the objective of experiment? What is product prepared?A typical amino acid with one amino group and one carboxylicacid group, such as serine, can exist in water in several ionic forms. (a) Suggest the forms of the amino acidat low pH and at high pH. (b) Amino acids generally havetwo pKa values, one in the range of 2 to 3 and the other inthe range of 9 to 10. Serine, for example, has pKa values of2.19 and 9.21. Using species such as acetic acid and ammoniaas models, suggest the origin of the two pKa values.(c) Glutamic acid is an amino acid that has threepKa's: 2.10, 4.07, and 9.47. Draw the structure of glutamicacid, and assign each pKa to the appropriate part of themolecule. (d) An unknown amino acid is titrated withstrong base, producing the following titration curve.Which amino acids are likely candidates for the unknown?
- Electrophoresis of a mixture of lysine, histidine, and cysteine is carried out at pH 7.64. Describe the behavior of each amino acid under these conditions.In preparation of p-Nitroaniline, Starting material is 50g of p-nitroacetanilide, 22ml of HCI, 20g of p-nitroaniline. Give % yield of nitro acetanilide.outline a separation scheme for isolating pure aspirin. lab video: https://www.youtube.com/watch?v=Y4NMpO1xI8U