Your Question About Easy Weight Loss

Linda asks…

why would you get 0% yeild when you extract you fischer esterification with diethyl ether?

In a fischer esterification experiment using formic acid and methyl alcohol a student got a 0% yeild. Main difference with her experiment and other’s experiment was that she extracted her solution with diethyl ether on top of water and sodium bicarbonate (each separately).

weight loss cardiff answers:

Two reasons come to mind. First, the product, methyl formate, would be very soluble in water, and highly resistant to solvent extraction. Second, the boiling point of methyl formate is quite low, 32 °C, so any product that might have been successfully extracted was probably lost when the ether was stripped.

Personally, I would have fractionally distilled the reaction mixture after neutralization of the acid catalyst, to get the product.

Mark asks…

Solubility of LiAlH4 and KAlH4 in diethyl ether?

Qualitatively predict the solubility of LiAlH4 and KAlH4 in diethyl ether and provide a concise explanation of the predictions made.

weight loss cardiff answers:

LiAlH4 is more covalent in general than KAlH4; therefore the solubility in ether will be much higher for LAH than for KAH.

William asks…

Can you please help me find the IR spectral charts for these compounds?

n-butane, ethanol, acetic acid, and diethyl ether. Yes, I am asking for help on my homework, but I have tried desperately to find these. I’m not interested in data tables, but a visual chart. There cannot be any functional groups intertwined with the readings. Only pure readings of the above choices.

Thank you!
plz, no sites or directories.

weight loss cardiff answers:

I refuse to do your work for you, but I’ll give you simple steps.

1. Go to http://www.sigmaaldrich.com/
2. Look up your compound.
3. On the right hand side, there should be Literature NMR and IR Spectra linked.

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