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Your guess of formation of Acrolein is a pretty good one, as indicated in this answer, but a boiling water bath will probably not give you the 160°C temperature you are looking for to convert glycerol to acrolein This question is most similar to yours and has a pretty good answer by bon. The answer says: However, from personal experience, gentle heating ...


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Reynolds Kitchens says Relnolds Wrap® is $98.5\%$ $\ce{Al}$ with the rest mostly $\ce{Fe}$ and $\ce{Si}$ to improve strength. You know this because when you dissolve it in $\ce{NaOH}$ solution to produce $\ce{H_2}$ a black residue remains undissolved; pure $\ce{Al}$ metal would leave no residue. Perhaps $\ce{Al}$ wiring would be more nearly pure because ...


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From the Institute of Minerals, Materials and Mining, Most aluminium foil is made from pure aluminium, but increasingly alloys are used to improve properties and reduce the thickness required. If you want to make sure that the Aluminium foil you're using is pure, the only way would probably to ask the manufacturer. Other than that, it could be the case ...


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