19F is the only isotope of fluorine that occurs naturally, and it has a nuclear spin of...
Question:
(a) Into how many peaks will the proton signal in the 1H NMR spectrum of methyl fluoride be split?
(b) Into how many peaks will the fluorine signal in the 19F NMR spectrum of methyl fluoride be split?
(c) The chemical shift of the protons in methyl fluoride is 4.3 ppm. Given that the geminal 1H±19F coupling constant is 45 Hz, specify the values at which peaks are observed in the proton spectrum of this compound at 200 MHz.
Step by Step Answer:
a The nuclear spin of 19 F is 12 that is the same as that of a pr...View the full answer
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The experiment aims to show the impact of various beverages on teeth by using eggs as a representation of enamel. Three eggs are boiled and then placed in glasses filled with fizzy drinks, vinegar, and mango juice for 24 hours. The shells of eggs are similar to enamel as they are composed of calcium carbonate, and enamel is primarily made of calcium phosphate. The eggs are then observed to demonstrate the effects of the different liquids on teeth and the importance of brushing regularly. The egg placed in fizzy drink has turned dark in color but can be cleaned by brushing with toothpaste and rinsing with water. The egg placed in vinegar has had its shell softened due to the chemical reaction of vinegar and calcium carbonate, which can\'t be reversed. This highlights the fact that acids are more damaging to teeth than other substances. The egg placed in mango juice represents the process of bacteria in the mouth converting sugars and starches into acids that form plaque, which can be prevented by brushing. The use of fluoride in toothpaste is also highlighted as it slows down the demineralization process and protects the enamel. The importance of brushing teeth twice a day is emphasized.
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