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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: bryanshore on October 24, 2010, 10:02:15 AM

Title: Chemistry help
Post by: bryanshore on October 24, 2010, 10:02:15 AM

why is the product precipitated when crude cinnamic acid is poured into a slight excess of concentrated hydrochloric acid solution

Title: Re: Chemistry help
Post by: discodermolide on October 24, 2010, 12:06:34 PM

Quote from: bryanshore on October 24, 2010, 10:02:15 AM

why is the product precipitated when crude cinnamic acid is poured into a slight excess of concentrated hydrochloric acid solution

Solubility?

Title: Re: Chemistry help
Post by: bryanshore on October 24, 2010, 01:01:12 PM

yeh i kinda guessed that, would be more helpful if someone could explain it in more detail

Title: Re: Chemistry help
Post by: bromidewind on October 24, 2010, 11:10:25 PM

I would assume that the reaction of the H⁺ with the hydroxyl group on the cinnammic acid would form water, and cinnammic acid is only slightly soluble in water (0.4 g/L), causing some of it to precipitate out.

Just my guess though, off the top of my head.