Spread the solid out on a watch glass or in the bottom of small uncovered beaker you do want the solvent to evaporate, right? Show the calculation of any items for which you needed a calculator in your notebook in a clearly-labeled Calculations section. That way you can use the crude mass for the actual yield and take the melting point of the crude product if something goes wrong during the recrystallization and you fail to isolate product. Each boldfaced section name should be included in the report. It's not a big deal if it fizzes over in the sink. Store in a tightly closed container. If not breathing, give artificial respiration.
Finely dispersed particles form explosive mixtures in air. First rinse with plenty of water for several minutes remove contact lenses if easily possible , then refer for medical attention. It is always legit to use a few mL of a solvent in which the solid does not dissolve the recrystallization solvent--chilled--is often a good choice to help transfer it to the funnel. If breathing is difficult, give oxygen. Closed system, dust explosion-proof electrical equipment and lighting. In case of fire use water spray, dry chemical, carbon dioxide, or appropriate foam. The data should be presented as an ordered numbered list.
Then just place the flask for the recrystallization on top of the gauze. Review your recrystallization technique before the lab. Chemical dangers Reacts with strong oxidants. Store in a cool, dry, well-ventilated area away from incompatible substances. Write the mechanism for the formation of the monoalkylation product, including the generation of the t-butyl cation and all four resonance structures of the sigma-complex intermediate.
Once the acid has vacated the cylinder, rest it in a beaker, put the whole thing in the sink and carefully add saturated sodium bicarbonate to it. Draw spectra of and do tables for any spectra taken, using the guidelines in the. Remove contaminated clothing and wash before reuse. This will suck the paper against the surface of the funnel so that less solid escapes between the paper and the funnel. Clothing: Wear appropriate clothing to prevent skin exposure. Avoid contact with eyes, skin, and clothing. Effects of short-term exposure Inhalation risk No indication can be given about the rate at which a harmful concentration of this substance in the air is reached on evaporation at 20°C.
You may chill it in the cylinder. Questions Don't retype the questions. Also attempt to explain a less-than-stellar yield. Since this isn't the most stable setup, you might want to either hold on to the flask or clamp it. Always start a filtration with a clean filter flask in case the product ends up down there, it's easier to retrieve from a clean flask , a clean funnel, and a fresh piece of filter paper. Keep the vacuum on while you pour the reaction mixture through and while you do any washings this is in contradiction to the lab book, which tells you to break the vacuum between washings.
Write the mechanism for the formation of the product observed starting from the monoalkylated compound and again showing all four resonance structures of the sigma-complex intermediate. This main purpose should appear within the first sentence of the conclusion. Sweep spilled substance into covered sealable containers. Instead of using a water bath, you can construct a sort-of steam bath by placing a wire gauze on top of a beaker of water on a hot plate. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
The published material is being distributed without warranty of any kind, either expressed or implied. After this when discussing the possible products throughout the conclusion you may a brief descriptor e. Rinse and then wash skin with water and soap. Use water spray, powder, alcohol-resistant foam, carbon dioxide. Experimental Data You may use the numbers in front of each of the items below in your report, or the both the numbers and the descriptions. Then store and dispose of according to local regulations. Sweep up, then place into a suitable container for disposal.
If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Measure the sulfuric acid with a dry 10-mL graduated cylinder. Skin: Wear appropriate gloves to prevent skin exposure. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. While you cannot always control the result of a recrystallization you can control whether or not you follow the advice about what to do before the recrystallization. .
Write all four resonance structures of the sigma-complex intermediate that would be formed in going from the monoalkylated compound to the dialkylated product that was not formed. Physical dangers Dust explosion possible if in powder or granular form, mixed with air. Extinguishing media: Use agent most appropriate to extinguish fire. Masses and melting points if appropriate will be done during the following lab period. Ingestion Do not eat, drink, or smoke during work. Solid products can be kept in your lockers until the following week. Place correctly-sized paper on funnel, moisten with the solvent the product has crystallized out of or a solvent in which it doesn't dissolve, and turn on the vacuum.