Benedict's or Tollens' Reagents: Reducing Sugars

Danielle Thibeadeaux
Flashcards by Danielle Thibeadeaux, updated more than 1 year ago
Danielle Thibeadeaux
Created by Danielle Thibeadeaux over 7 years ago
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22.6 A

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Question Answer
Benedict's reagent an ______ solution containing a _____ _____ complex ion. Benedict's reagent an alkaline solution containing a cupric citrate complex ion.
Tollens' solution _________ oxidize giving a positive test with _____ and _____. Tollens' solution [Ag+(NH3)2OH-] oxidize giving a positive test with aldoses and ketoses.
The tests are ________ even though aldoses and ketoses exist primarily as _____ ________. The test are positive even though aldoses and ketoses exist primarily as cyclic hemiacetals.
Benedict's solution is the color ______ from the _____. Once it oxidizes an aldose or ketose it becomes a ______ color of the precipitate ______. Benedict's solution is the color blue from the Cu+2. Once it oxidizes an aldose or ketose it becomes a brick-red color of the precipitate CU2O.
In alkaline solution ketoses are converted to _______ which are then oxidized by the ________ complexes. In alkaline solution ketoses are converted to aldoses which are then oxidized by the cupric complexes.
Sugars that give a positive test with ________ or ________ solutions are known as ________. Sugars that give a positive test with Tollens' or Benedict's solutions are known as reducing sugars.
All __________ that contain a ________ ______ give positive test. All carbohydrates that contain a hemiacetal group give positive test.
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