Mark asks…
I have an solid with organic compound, I mix it with diethyl ether & NaOH. What is contained in each layer?
1)The aqueous layer will come to the top of the solution and the either layer will go to the bottom correct?
2) Will the ether layer exclusively contain the organic compound?
3) What then is in the aqueous layer? The impurities?
EDIT – I meant to say the ether will form the top layer and the aqueous layer will form the bottom. I apologize.
weight loss cardiff answers:
I am assuming that you are talking about aqueous NaOH, pure NaOH is a solid.
Most ether will be less dense than water and so will be found on the top layer. Solvents such as chloroform are more dense and so will be on the bottom. Diethyl ether a commonly used solvent has a density of 0.7134 (compared to water which is 1)
The ether layer should contain the organic compound unless it has a strongly acid nature. As the NaOH will deprotonate it causing it to be polar adn so will be water soluble, if no acid is mentioned then ot will be in the organic layer
The aqueous layer with contain Na+ and Cl- ions and any water soluble impurities
Jenny asks…
What is the heat required to melt 52.3 g of solid diethyl ether, (C2H5)2O, at its melting point?
The ΔH° of fusion of diethyl ether is 7.66 kJ/mol.
Thanks so much! I cant quite get this one! and can you explain/show the steps too please?
weight loss cardiff answers:
Use molar mass to find moles
52.3 grams @ 74.12 g/mol = 0.7056 moles of ether
0.7056 moles of ether @ 7.66 kJ/mol = 5.40 kJ
you must add 5.40 kJ of heat to melt that # of grams of ether
Robert asks…
Should succinic acid dissolve in diethyl ether when heated?
In a lab, i put succinic acid in different solvents to determine if it would dissolve at room temp, and then if it would when heated. For diethyl ether as the solvent, I got the results that it was not soluble at room temp, or when heated, though i feel like it should have dissolved when heated.
It was heated in a pyrex reaction tube in sand bath… not dangerous
weight loss cardiff answers:
Very dangerous to heat diethyl ether
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