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Fehling's solution is prepared by combining two separate solutions: Fehling's A, which is a deep blue aqueous solution of copper(II) sulfate, and Fehling's B, which is a colorless solution of aqueous potassium sodium tartrate (also known as Rochelle salt) made strongly alkaline with sodium hydroxide. These two solutions, stable separately, are ...
Known as Fehling's solution it is a solution of copper sulfate mixed with alkali and potassium sodium tartrate (Rochelle salt). He was a contributor to the Handwörterbuch of Liebig, Friedrich Wöhler and Johann Christian Poggendorff , and to the Graham-Otto Textbook of Chemistry .
It is an ingredient of Fehling's solution (reagent for reducing sugars). It is used in electroplating , in electronics and piezoelectricity , and as a combustion accelerator in cigarette paper (similar to an oxidizer in pyrotechnics ).
Benedict's reagent (often called Benedict's qualitative solution or Benedict's solution) is a chemical reagent and complex mixture of sodium carbonate, sodium citrate, and copper(II) sulfate pentahydrate. [1] It is often used in place of Fehling's solution to detect the presence of reducing sugars and other reducing substances. [2]
It is advised to check the references for photos of reaction results. [1] Reagent testers might show the colour of the desired substance while not showing a different colour for a more dangerous additive. [2]
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Reducing form of glucose (the aldehyde group is on the far right). A reducing sugar is any sugar that is capable of acting as a reducing agent. [1] In an alkaline solution, a reducing sugar forms some aldehyde or ketone, which allows it to act as a reducing agent, for example in Benedict's reagent.
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