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Donna asks…

what are functions of sulfuric acid quenching reaction of ketone mixture?

In an experiment of making tertirary alcohol using grignard synthesis, magensium, isobutyl bromide and a ketone was used. in part of the experiment the unknown ketone was mixed with diethyl ether and stirred for several mintures and then finally quenched with sulfuric acid before added to the unknown bromide solution. why?

weight loss cardiff answers:

The usual purpose of adding acids or bases to a mixture is to alter the ph levels. If the constitutes of the acid does not enter into the reaction, then the ph level need to be changed to form the reaction with the bromide. Most likely forming a precipitate of ethylene bromide in alcohol.

Mary asks…

I need some help with chemistry ASAP please?

Calculate the mass (g) of the solute diethyl ether and the mass (kg) of the solvent chloroform that should be combined to prepare 9340 g of a solution that is 2.80 parts per hundred by mass diethyl ether.

weight loss cardiff answers:

2.80 = mass solute x 100/ 9340

mass solute = 261.5 g

mass water = 9340 – 261.5 = 9078.5 g => 9.0785 Kg

Mandy asks…

What would happen if petroleum ether was used instead of dry diethyl ether for grignard reaction?

The reaction being grignard reaction with the preparation of phenylmagnesium bromide from bromobenzene, dry ether and magnesium. Would the petroleum ether not produce the grignard reagent?
but why do they require diethyl ether? petroleum ether also has that O that can be used, does it not?

weight loss cardiff answers:

I thought this was already aswered.
Grignard reagents require a true ether solvent for their formation. Petroleum ether is a hydrocarbon.

There is no O in pet ether. It’s just a cut of pentane, with some cats and dogs left in it. It will not make a Grignard reagent.

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Your Question About Easy Weight Loss

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William asks…

Can make a diethyl ether solution by heating up sulfuric acid and adding tequilla or vodka?

I want to make some diethyl ether for an experiment at home. I have some drain cleaner which is basically highly concentrated sulfuric acid and some tequila. If I were to heat the sulfuric acid up and add some ethanol from the tequila will it create a diethyl ether compound?

weight loss cardiff answers:

Using tequila or vodka would probably not result in very high yields, as those contain a lot of water, which doesn’t help the desired process. You’d also need to distill the ether that is produced to get some yield, which is difficult to do with household items. I would also advise you not to heat sulfuric acid at home under any circumstances; the acid itself does not boil easily, but water or ether or ethanol do, resulting in small splashes of acid, which can be very dangerous. Of course, hot acid is also rather more corrosive than when it’s cold…

Ruth asks…

Why does diethyl ether have a lower boiling point than acetone?

Why is it that diethyl ether‘s bp is at 34.6°C and acetone’s bp is at 56.5°C? Aren’t both equally polar?
Shouldn’t diethyl ether have the higher bp because of the fact that it can produce stronger London dispersion forces (more electrons than acetone)?

weight loss cardiff answers:

The dipole moment of diethyl ether is 1.15 Debye. The dipole moment is of acetone is 2.91 Debye — 2.5 times greater than that of ether.

So, no, they are far from being equally polar and the London forces are insignificant in comparison.

The 3D pictures in the links below should make it clear as to why acetone is more polar.

Robert asks…

How to separate mixture dissolved in diethyl ether that contains acetic acid? (Hmwk due tmrw!)?

A crude non acidic product mixture dissolved in diethyl ether contains acetic acid. Describe an extraction procedure that could be used to remove the acetic acid.

weight loss cardiff answers:

If you mix it with water the water should absorb the acetic acid from the ether. Alternately, ether evaporates at a crazy rate. Warm the mixture GENTLY and WITHOUT FLAME and you’ll have the acid by itself. Ether is extremely flammable as well, so flame anywhere nearby will result in lost eyebrows and possibly lab.

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