View source for Fehling's solution

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'''Fehling's solution''' is the name given to a chemical reagent, primarily used to differentiate between water-soluble carbohydrate and ketone functional groups. It can also be used as a test for reducing sugars and non reducing sugars.  This reagent is prepared from two solutions, a basic solution of [[potassium sodium tartrate]] and a solution of [[copper(II) sulfate]].

==Properties==
===Chemical===


===Physical===


==Availability==
Reagent "A" and Reagent "B" are available from Sigma Aldrich.

==Preparation==
*Fehling's "A" uses 7 g CuSO<sub>4</sub>·5H<sub>2</sub>O dissolved in distilled water containing 2 drops of dilute sulfuric acid.
*Fehling's "B" uses 35g of potassium tartrate and 12g of NaOH in 100 ml of distilled water.
These two solutions should be stoppered and stored until needed.

For the test:
Mix 15 ml of solution-"A" with 15 ml of solution-"B"
Add 2 ml of this mixture to an empty test tube. 
Add 3 drops of the compound to be tested to the tube.
Place the tube in a water-bath at 60° C.

A positive test is indicated by a green suspension and a red precipitate

==Projects==


==Handling==

===Safety===

===Storage===
Solution A and B should be stored separately in tightly stoppered bottles.  They are stable under normal temperatures and pressures.

===Disposal===

==References==
Preparation from UWI at Mona, Jamaica: [[http://wwwchem.uwimona.edu.jm/courses/Fehling.html]]
<references/>

===Relevant Sciencemadness threads===

[[Category:Materials with no specific chemical formula]]
[[Category:Copper compounds]]
[[Category:Coordination complexes]]
[[Category:Test methods]]