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Posted by on Monday, October 5, 2009 at 10:04am.

Assume that during an extraction experiment you have lost track of which layer is the aqueous layer. How could you determine which layer is which by the use of a simple test?

  • Orgo - , Monday, October 5, 2009 at 10:22am

    Orgo or Ortho? Try the following:

    http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=7EU&ei=IgHKSqoplLowlcG48gc&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=how+to+tell+the+aqueous+layer+during+extraction&spell=1

    Sra

  • Orgo - , Monday, October 5, 2009 at 10:25am

    you got it right in the search. Organic Chem

  • Orgo - , Monday, October 5, 2009 at 10:40am

    The shape of the miniscus is often a good way to tell.

  • Orgo - , Monday, October 5, 2009 at 10:43am

    Could you elaborate Dr Russ?

  • Orgo - , Monday, October 5, 2009 at 11:03am

    The aqueous phase has a concave meniscus. The majority of organic phases have a convex or flat meniscus. Thus by looking at the interface between the two phases it is often easy to decide which is which. With experience you can tell by letting a little out of the bottom of the separating funnel in to the tube below the tap. The aqueous phase tends to form a drop which stays put while an organic phase immediately runs out of the tube.

    If the two phases are in a separating funnel then drop a little of the phases on to a waxed/greased surface. The aqueous phase forms blobs while the organic phase tends to spread out.

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