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fehling's solution is dark blue at room temperature
"Fehling's solution" is prepared by dissolving separately 34'639 grammes of copper sulphate, 173 grammes of Rochelle salt, and 71 grammes of caustic soda in water, mixing and making up to l000 ccs.; 10 ccs. of this solution is completely reduced by o 05 grammes of hexose
Wiki User
∙ 15y ago
Wiki User
∙ 9y agoFehling's solution is prepared just before use by mixing equal volumes of two previously prepared solutions, one containing about 70 grams cupric sulfate pentahydrate per liter of solution and the other containing about 350 grams Rochelle salt (potassium sodium tartrate tetrahydrate) and 100 grams sodium hydroxide per liter of solution. The cupric ion (complexed with tartrate ion) is reduced to cuprous ion by the aldehyde (which is oxidized) and precipitates as cuprous oxide (Cu2O); for this reason, sugars that react with Fehling's solution are called reducing sugars.
Wiki User
∙ 10y agoFehling's solution is mixed because it takes Fehling's A and Fehling's B to make the solution. The solution needs to be prepared fresh before it is used.
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The acid which reduces Fehling's solution is?
h2so4 can reduce fehling solution
Why are fehling solution A and B kept separately?
fehling a is copper sulphate and fehling b is alkaline solution of sodium pottasium tartarate
Can I replace Fehling solution with Benedict's solution?
Yes, these solutions are interchangeable.
Why does the fehlings solution turn red?
When Fehling's solution is added to an aldehyde it turns brick red
What regent is used to test for starch?
Fehling A and B Benedict solution
The acid which reduces Fehling's solution is?
h2so4 can reduce fehling solution
What is the composition of fehling's solution?
Fehling's solution A= concentrated aqueous solution of Copper (II) sulphate, Fehling's solution B= solution of Sodium-potassium tarterate + sodium hydroxide.
Why are fehling solution A and B kept separately?
fehling a is copper sulphate and fehling b is alkaline solution of sodium pottasium tartarate
What is fehlings solution?
Fehling solution "A" is copper sulphate solution and Fehling solution "B" is a solution of sodium potassium tartrate and NaOH.
Does formalin give positive Fehling's solution test?
Formalin gives a positive Fehling's solution test.
What is the difference between Benedict's solution and fehling's solution?
Fehling's test uses tartaric acid, and Benedict's test uses citric acid
Can I replace Fehling solution with Benedict's solution?
Yes, these solutions are interchangeable.
Why do you have to keep fehling's A with fehling'a B?
Fehling's A and Fehling's B are used together in the Fehling's test to detect the presence of reducing sugars, such as glucose. Fehling's A is a copper(II) sulfate solution, while Fehling's B is a complex solution of potassium sodium tartrate and sodium hydroxide. They work together to oxidize the sugar, causing a color change that indicates the presence of a reducing sugar.
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 has the author Winford Lee Lewis written?
Winford Lee Lewis has written: 'On the action of Fehling's solution on malt sugar ..' -- subject(s): Malt sugar, Fehling's solution
What has the author Ernest Anderson written?
Ernest Anderson has written: 'Rachel Outgrows the Easter Bunny' 'On the action of Fehling's solution on galactose ..' -- subject(s): Galactose, Fehling's solution
Why benzaldehyde doesn't give fehling solution test?
Benzaldehyde is the simplest aromatic aldehyde. The oxidizing agent used in Fehling's solution is not strong enough to oxidize the aromatic ring. Therefore Benzaldehyde doesn't show Fehling's test. I hope it helped :)
