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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