Chemistry, 22.03.2020 00:38 lesok0818

How do you know you made aspirin?

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You would likely combine Salicylic Acid and an acetylating reagent; (Acetic anhydride is much nicer to work with than acetyl chloride, et al); but regardless of which you use, you would need to purify the product, and recrystallize the product in very cold ethanol or another suitable reagent. After that, use a melting point apparatus first; the accepted value of Pure Aspirin, acetylsalicylic acid, is expected at 138°C-140°C. Any starting material contamination will cause the temperature to be lowered. A melting point is quick, cheap, and can be done at the lab desk. If you have a Pure Standard, you can use Gas Chromatography, but that can be time consuming compared to taking the M.P.; Proton NMR, even Carbon 13 NMR, but a good M.P. apparatus should still be done first; if the M.P. is depressed, you would need to recrystallize to see a “nice” NMR spectra. Infra Red Spectroscopy has its place, but it does have limitations. It IS quick, but you would need to know how to evaluate IR, or NMR; M.P. is convenient and also a very old, reliable test. Naturally, a 1H NMR would be nice to have as well, but for a laboratory Class exercise, likely not that essential.

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In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body. nephology is the science of clouds, which is undertaken in the cloud physics branch of meteorology.cirrus clouds usually describe clouds high in the atmosphere that can include wispy clouds, typically with ice crystals. variations include cirrus, cirrocumulus and cirrostratus as defined by the cloud's position in the atmosphere.layered stratus clouds have both flat tops and bases, and can appear as if they take up the whole sky, stretching from horizon to horizon. other combinations and variations include stratus, stratocumulus, nimbostratus and altostratus.cumulus clouds often pile up in multiple layers of the atmosphere, representing clouds that develop vertically. cumulus clouds often look like pillars with anvil-type tops or columns of clouds stacked vertically. variations include cumulus, cumulus-congestus, cumulonimbus and altocumulus.

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Elias is almost correct. he just got it backwards.the correct answer is that it demonstrates elastic potential energy transforming into kinetic energy.

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