One mole of acetyl chloride was mixed with one mole of dimethylamine. After the reaction is complete, what species can be found in the mixture? Draw only the organic structures (i.e., omit inorganic ions). Show charges where necessary. 1
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- Compounds with a lower boiling point and higher boiling point will what? A. Rapidly cool down in the fractionating column B. Never evaporate C. Rapidly evaporate in the fractionating column D. Be extracted from the higher parts of the fractionating columnEach of the student statements below is wrong. Explain why they are not correct. (a) All my compound dissolved right away in the small amount of solvent I added at room temperature, and I didn’t need to heat it at all. This means I’m going to get lots of pure compound out. (b) I did a recrystallization of naphthalene and my percent recovery was very high (99%), so I must have pure product. (c) When you’ve dissolved all your compound in hot solvent, and you’re in a hurry, it’s ok to just place it straight into the ice bath.An organic chemistry laboratory Extraction; the extraction of crude naphtalene- benzoic acid mixture. Naphthalene is a suspect carcinogen and is toxic to aquatic life. Find an alternative pair of molecules that adhere better to the principles of green chemistry and can be separated by extraction using green' solvents. (kindly answer fully)
- How many equivalents of CH3MgI is needed to make compound X?Compound A is impure and has a melting point of 90°C - 98°C. After purification, A will most likely have a melting point of: *Detection of Choline Reagent’s Composition Observations: Inferences: What is the principle behind this test? Identify the gas that evolved after the reaction.
- what volume of 1-pentanol is needed to convert 1.50 grams of benzhydrol to n-pentyl benzhydrol etherp-toluic acid is prepared from 3.42 grams of p-Bromotoluene. When p-Bromotoluene was mixed with dry ether, the mixture was warmed until the ether begins to boil (34.6 °C). When the reaction is almost complete, dry ice (3-4 mL in a beaker) was prepared and the mixture was poured into it. After some time, 5 mL of 6 N HCl was added. The solvent used for the recrystallization is 100 mL of 30% ethanol. The reaction equation is given on the figure. What is the actual yield? What is the theoretical yield? How many moles of p-toluic acid was produced?ou have bought a new reagent, on the data sheet it says “stable at 4°C for 1 month, for long-term storage up to 1 year, store at -20°C” and “avoid repeated freeze thaw”. You don’t think you will use the whole vial in the next month, what should you do?* Aliquot into 20 tubes of equal volumes, label the tubes and store in a lab freezer. Store at 4°C for the first month and then aliquot whatever is left Tell the technical team or lab mates to arrange aliquoting and storage Calculate how much you will use in each experiment and aliquot the reagent into thoseamounts into labelled tubes and store in a labelled container in a lab freezer
- 4) Why might a student obtain a percent yield more than 100% for this preparation?Someone decided to try to recrystallize the molecule biphenyl using benzene as a solvent, but although they only had a 5% impurity, they recovered less than 10% of their total product! Assuming they didn’t lose any compound to a lab mishap, explain why their yield is likely to be so low.Benzoic acid was synthesized by carbonating a Grignard reagent. In a first step, 8.0 grams of dry magnesium shavings and a small iodine crystal, 15.0 grams of bromobenzene and 20 mL of dry ether are mixed. After gentle heating, the iodine decolorized, which was a sign that the Grignard reagent C 6 H 5 MgBr had been formed. After the Grignard reagent is separated, it is allowed to react with carbon dioxide (CO 2 (s)) and excess dilute hydrochloric acid (forming benzoic acid and MgClBr). Benzoic acid formed is transferred to the anion form by addition of NaOH and the organic and aqueous phases are separated. Benzoic acid (C 6 H 5 COOH (s))extracted by precipitation from the water phase, including hydrochloric acid and subsequent filtration. Recrystallized precipitate weighs 6.36 grams. Write the reaction formula and calculate the yield