February 25, 2017

Homework Help: Org. Chem.

Posted by CM on Monday, September 21, 2009 at 10:38pm.

what is the precipitate formed when HCl is added? I believe the answer is NaCl, but I am not sure and this precipitate only formed in the first NaOH extract, as precipitate was essentially nonexistent in the 2nd extract? Below is what was done in the experiment. Also, does the amount of precipitate in each tube indicate that all the acid impurity has been removed from the ether layer containing the unknown neutral compound? I believe precipitate formation means impurity is still present?

0.150g of an unknown mixture was placed in a centrifuge tube with 4 mL of ether. It was shook until the solid was completely dissolved. Then 2 mL of 1.0 M NaOH was added, tube shook, layers were left to separate, bottom (aqueous) layer was removed (1st NaOH extract). 2 mL more of 1.0 M NaOH were added to the tube, shook, layers separate, aqueous layer removed (2nd NaOH extract). Added 6 M HCl to each extract until each mixture was acidic. Precipitate formed at this point.

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