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- Chemistry why dose the reaction of an amine with formic anhydride occur at room temperature,while the reaction of an amine with acetic anhydride needs a temperature of about 50-60 C ?1. The conversion of the concentrations into the required expression is as follows: Concentration given Expression required 0.5% NaCl molarity 1 mM of KBr mg/ml 5 mg/100 ml paracetamol Molarity 0.15 N H2SO4 g/litre 0.5% ethanol/water (w/v) ppm 2. 0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and was analysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity. What is the level of impurity in % w/w and ppm? 3. Calculate the pH of a buffer system made by dissolving 1.2 g of acetic acid and 0.82 g of sodium acetate in 500 ml of distilled water (pKa of acetic acid = 4.7) 0.641 g of a semi-synthetic alkaloid was dissolved in 25 ml of 1% w/v acetic acid and was analysed directly by HPLC. The solution was found to contain 1.42 mg/100 ml of an impurity. What is the level of impurity in % w/w and ppm?Write the reactions of Aromatic Primary - aliphatic secondary and tertiary amines with 2 N HCl and 5% NaNO2 in ice bath at 50C
- The compound acetophenone has a very similar molar mass to that of benzoic acid and benzamide. However, acetophenone has a much lower m.p. (20 °C) than both such that, by contrast, it is a liquid at room temperature. By considering intermolecular forces and comparing functional group structure, account for this big difference in physical properties.Can any functional groups on Risperidone ionize? If so, which ones? Under what conditions? What are the pKa values of these functional groups? Write the structures in their correct ionization state at physiological pH.A student was trying to determine the identity of an unknown compound. The melting point of the compound was 117-118oC. The student narrowed the possible compound down to the following: Compound Melting Point Range acetanilide 113-115oC fluorene 114-116oC mandelic acid 120-122oC A second student, doing the same experiment as above, found that their melting point was 100-108oC. What is wrong with the student’s melting point? Propose two reasons why the melting point could be incorrect. View keyboard shortcuts
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- Does it safe to use this sunscreen K on acne prone skin. And can we rinse off it by only using facial gel mixed with water to rinse off it without use oil. Do I need to use micellar water for removing cosmetic before rinse off it with facial gel Sunscreen K has lists of ingredients below (descending order)…. AQUA DIMETHICONE CYCLOPENTASILOXANE PROPYLENE GLYCOL NIACINAMIDE DIETHYLHEXYL CARBONATE ZINC OXIDE CETEARYL ALCOHOL POLYMETHYL METHACRYLATE SODIUM POLYACRYLOYL-DIMETHYL TAURATE TITANIUM DIOXIDE ETHYLHEXYL METHOXYCINNAMATE BUTYL METHOXYDIBENZOYLMETHANE GLYCERYL STEARATE BIS-PEG/PPG-20/5 PEG/PPG-20/5 DIMETHICONE METHOXY PEG/PPG-25/4 DIMETHICONE HYDROGENATED POLYDECENE BUTYLENE GLYCOL OCTOCRYLENE PEG-40 STEARATE PHENOXYETHANOL HEXYL LAURATE POLYHYDROXYSTEARIC ACID CAPRYLIC/CAPRIC TRIGLYCERIDE STEARIC ACID CETYL ALCOHOL PEG-10 DIMETHICONE CETEARETH-20 TOCOPHERYL ACETATE STEARYL ALCOHOl PHENYL TRIMETHICONE TRIETHOXYCAPRYLYSILANE TRIDECETH-10 CHLORPHENESIN DISODIUM EDTA DIMETHICONOL…Define the Mechanism - Conversion of Carboxylic Acids to Amides with DCC1. Write the observations and results when (a)Fumaric Acid is reacted with Sodium Hydroxide,(b)when reacted with Sodium Bicarbonate. Write also the reaction equations. 2. Solubility of Amines in AcidPut 2 ml of water in a 10x75-mm test tube. Add 5 to 10 drops of aniline. Add 6 N hydrochloric acid dropwise until the aniline dissolves. Then add 6 N sodium hydroxide until the aniline reappears. Write the observations/results in this experiment and the reaction equation.