synthesys (Stranger)
03-23-03 11:46
No 420548
      Testing your ketone + other resourse  Bookmark   

Sodium Bisulfite Addition Complex
                              H
 O                           |
 ||  +  NaHSO3  -->  ---OH
/  \                          |
                             SO3 - Na+
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Aldehyde and Ketone
 

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Procedure
Place 1 mL of sodium bisulfite reagent in a test tube and add 0.3 mL or 300 mg of unknown. Stopper the test tube and shake vigorously.

Sodium bisulfite reagent: Add 1 mL of ethanol to 4 mL of a 40% aqueous solution of sodium bisulfite. Decant or filter the solution prior to use.

Positive Test:
Formation of a precipitate is a positive test.

Complications:
Aryl methyl ketones form the precipitate slowly or not at all.

Addition complex stable only in neutral solution.
___________________________________________________________
There are some stingy bees on the Hive that will not share their resources, I will not name drop, you all know who you are. My message to you is FUCK YOU. Took me some time to find this, so I wanted to share this with other people trying to learn.

Here is another useful link, that will give you some options for testing your reagents:

http://www.chemistry.ccsu.edu/glagovich/teaching/472/qualanal/tests/tests.html
 
 
 
 
    Rhodium
(Chief Bee)
03-23-03 11:51
No 420549
      Bisulfite  Bookmark   

Post 69041 (Rhodium: "Re: What makes bisulfite work?", Chemistry Discourse)

../rhodium/chemistry /eleusis/bisulfite.html