What is Fehling’s Solution?

In organic chemistry, Fehling’s solution is defined as a chemical reagent that is used to check the presence of aldehyde (-CHO functional group). Fehling’s solution acts as a mild oxidizing agent, it is dark blue in colour and basic in nature.

Learn more about, Oxidation of Aldehydes

It is a chemical mixture made up of two chemicals: Copper Sulphate and Rochelle salt (Potassium Sodium Tartrate solution), which are known as Fehling A and Fehling B solutions respectively. This solution can be used to differentiate between ketone and water-soluble carbohydrates. It is used as a supplement to the Tollens’ Reagent Test.

The most important use of this solution is to carry out Fehling’s test, this test is used to check the presence of reducing sugar (for example, glucose). This solution was named after a German chemist Hermann von Fehling, who developed it in 1849.

Fehling’s Solution

Fehling’s Solution is a chemical reagent that is used to check the presence of aldehyde functional groups in organic compounds. It is also used to differentiate between water-soluble carbohydrates (like glucose, fructose, etc.) and ketone(-C=O-) functional groups.

In this article, we will learn more about Fehling’s solution, its formation, its test, and some of its uses.

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What is Fehling’s Solution?

In organic chemistry, Fehling’s solution is defined as a chemical reagent that is used to check the presence of aldehyde (-CHO functional group). Fehling’s solution acts as a mild oxidizing agent, it is dark blue in colour and basic in nature....

Preparation of Fehling’s Solution

The preparation of Fehling’s solution involves the mixture of two chemicals named Fehling A solution and Fehling B solution. These solutions are prepared separately in laboratories and later mixed together in equal amounts to form a solution called Fehling’s solution....

What is Fehling’s Test?

Felhing’s test is used for the detection of aldehydes in the solution. In this test, the freshly prepared Fehling’s solution is added to the compound containing an aldehyde group. This will result in the formation of a reddish-brown colour precipitate confirming the presence of aldehyde in the compound....

Reaction of Fehling’s Test

In Fehling’s test, the redox reaction takes place. In this reaction, copper(II) ions dissociate into copper(I) ions and aldehyde oxides to form carboxylic acids....

Limitations of Fehling’s Test

Some Limitations of Fehling’s Test are,...

Uses of Fehling’s Reagent

Various uses of Fehling’s Solutions are,...

Fehling’s Solution-FAQs

1. What is Difference between Fehling’s and Tollen’s solution?...