Sodium Bisulfite Addition Complex
H
O |
|| + NaHSO3 --> ---OH
/ \ |
SO3 - Na+
--------------------------------------------------------------------------------
Aldehyde and Ketone
--------------------------------------------------------------------------------
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 (http://www.chemistry.ccsu.edu/glagovich/teaching/472/qualanal/tests/tests.html)
Post 69041 (missing)
(Rhodium: "Re: What makes bisulfite work?", Chemistry Discourse)
https://www.thevespiary.org/rhodium/Rhodium/chemistry/eleusis/bisulfite.html (https://www.thevespiary.org/rhodium/Rhodium/chemistry/eleusis/bisulfite.html)