Chemical Forums
Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: HerrSwampy on October 11, 2022, 12:46:53 PM
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Hello, in my psychical chemistry lab we had done crysocopy exercise and i need to indentify chemical based on thesee informations:
molar mass: 45,21088 g/mol
white powder, easily made tablets with just pressure
Easily dissolves in water
Thanks for an help
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What are your thoughts?
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It could have been MgO, but i am not sure at all
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If it was psychical chemistry, you should just know.
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Sadly it was cryoscopy, and they just gave us the chemical and told us to find its molar mass and try to think what chemical it is
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It could have been MgO, but i am not sure at all
Would MgO easily dissolve in water?
molar mass: 45,21088 g/mol
If it is your experimental value, it opens many more options. What is the heaviest element that the compound can contain? It is a compound, how many elements minimum does it contain? If so - what are possible molar masses of these element? Which elements fit? It is soluble - does it limit the selection of compounds? And so on.
Plus: often you are given a list of compounds to choose from.
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We were not given a list and yeah it was a experimental value of molar mass, so it could slightly different, I basicly need some idea that is closest to it
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Can't think of anything else than trial and error building on the ideas I listed - or finding on the web a database of compounds and searching it for compounds with similar molar mass.
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MgO would give an alkaline solution and its molar mass (40 g) differs from yours (45 g). There are other compounds that fit better - LiCl, Li2S and NaF.