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When Fehling's solution is added to an aldehyde it turns brick red
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∙ 10y ago
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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 product obtained by combining fehlings a and fehlings b solution?
When the two Fehling Solutions A and B are mixed, a deep blue solution containing a complex cupric ion is formed. On interaction with reducing compounds such as aldehydes or sugars, the copper is reduced to the univalent stage, and a red, yellow, or yellowish green precipitate is formed.
Why is it important that fehlings solution be freshly prepared?
Fehling's solution must be freshly prepared because there is a tendency for it to oxidize if not used right away
What is an acidic solution will turn blue litmus paper to what color?
Red color in acidic solutions and blue color in basic solutions.
What color does litmus blue and red paper turn in acid?
im thinking it would turn red:)
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 fehlings solution?
Fehling solution "A" is copper sulphate solution and Fehling solution "B" is a solution of sodium potassium tartrate and NaOH.
What is the product obtained by combining fehlings a and fehlings b solution?
When the two Fehling Solutions A and B are mixed, a deep blue solution containing a complex cupric ion is formed. On interaction with reducing compounds such as aldehydes or sugars, the copper is reduced to the univalent stage, and a red, yellow, or yellowish green precipitate is formed.
Wll Ribose will turn Benedict's solution red?
will ribose turn benedicts solution red
What is a positive result for the fehlings test?
Fehlins test is done to identify aldehides. Fehlins solution is used for this test. If aldehides are added to this soluton, a red precipitate is formed.
Why is it important that fehlings solution be freshly prepared?
Fehling's solution must be freshly prepared because there is a tendency for it to oxidize if not used right away
Does vinegar make litmus paper turn red?
Litmus paper turns red if the solution is acidic and blue if the solution is basic. Vinegar is an acidic solution (due to acetic acid), and will turn the litmus paper red.
What chemical formula for Fehlings reagent?
The Fehling A solution contain copper sulfate.The Fehling B solution contain sodium potassium tartrate and sodium hydroxide.
Which substance will give a red precipitate when heated with Fehling solution?
Cu2O gives red ppt when heated with fehlings soln
What happens to aldehyde when it reacts with fehlings solution or tollens solution?
Aldehyde are oxidised to the corresponding carbonic acid by F.'s or T.'s agents. Ketone can not be oxidised.
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
What happens when a base is added to red cabbage solution?
Base turn red cabbage solution to blue-ish purple
