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The Fehling's solution turns red when it comes into contact with reducing sugars such as glucose. This color change occurs because the reducing sugars react with the copper ions in the Fehling's solution to form a red precipitate of copper(I) oxide. This is a characteristic test used to detect the presence of reducing sugars in a solution.
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Why the oxidation of formic acid gives red precipitate while the oxidation of acetic acid not?
I think you are referring to the test using Fehlings solution. Fehlings solution oxidises aldehydes and ketones and formic acid and is in turn reduced. The red precipitate is the copper(I) oxide formed by reduction of the copper(II) complex found in Fehlings solution. Acetic acid is not readily oxidised and so there is no precipitate. See link for more information on what the complex is in Fehlings solution and how it is prepared.
What is the original colour of fehlings a solution?
Fehling's A solution is blue in color due to the presence of copper sulfate.
What is the original colour of fehlings solution?
Fehling's solution is originally blue in color due to the presence of copper ions.
What is the color of the fehlings solution?
Fehling's solution is typically blue in color due to the presence of copper ions. When Fehling's solution is mixed with reducing sugars, such as glucose, it turns from blue to brick-red or yellow-brown due to the formation of a copper oxide precipitate.
Red litmus will turn blue when placed in an aqueous solution of?
Blue in Base
Why the oxidation of formic acid gives red precipitate while the oxidation of acetic acid not?
I think you are referring to the test using Fehlings solution. Fehlings solution oxidises aldehydes and ketones and formic acid and is in turn reduced. The red precipitate is the copper(I) oxide formed by reduction of the copper(II) complex found in Fehlings solution. Acetic acid is not readily oxidised and so there is no precipitate. See link for more information on what the complex is in Fehlings solution and how it is prepared.
What is the original colour of fehlings a solution?
Fehling's A solution is blue in color due to the presence of copper sulfate.
What is the original colour of fehlings solution?
Fehling's solution is originally blue in color due to the presence of copper ions.
Do Acids turn universal indicator solution yellow or red?
Acids turn universal indicator solution red.
What is the color of the fehlings solution?
Fehling's solution is typically blue in color due to the presence of copper ions. When Fehling's solution is mixed with reducing sugars, such as glucose, it turns from blue to brick-red or yellow-brown due to the formation of a copper oxide precipitate.
What color would red litmus paper turn in phosphate solution?
Red litmus paper would turn blue in a phosphate solution, indicating that the solution is basic.
Wll Ribose will turn Benedict's solution red?
Yes, Ribose will turn Benedict's solution red because it is a reducing sugar. Benedict's solution changes color when it reacts with reducing sugars like ribose due to the formation of a red-orange precipitate of copper(I) oxide.
What is a positive result for the fehlings test?
A positive result for the Fehling's test indicates the presence of a reducing sugar such as glucose or fructose in the solution. This is shown by the formation of a brick-red precipitate when the Fehling's reagent is added and heated with the sugar solution.
What chemical formula for Fehlings reagent?
The Fehling A solution contain copper sulfate.The Fehling B solution contain sodium potassium tartrate and sodium hydroxide.
What color does a strip of litmus paper turn when it is dipped into an acidic solution?
A strip of litmus paper will turn red in an acidic solution.
Which substance will give a red precipitate when heated with Fehling solution?
Glucose will give a red precipitate when heated with Fehling solution. This reaction indicates the presence of a reducing sugar.
Why does soap and lime juice solution turn red with turmeric?
lime juice and soap solutions turn red in turmeric because turmeric is an organic indicator which turns red in acidic or basic solution and lime juice is an acidic solution while soap is a basic solution
