Answered: Both Fehling’s and Benedict’s solutions…

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter11: Ethers, Epoxides, And Sulfides

Section: Chapter Questions

Problem 11.41P: Aldehydes and ketones react with one molecule of an alcohol to form compounds called hemiacetals, in...

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Question

During an experiment in your chemistry lab, your instructor assigned your group to make a refill of Fehling’s A and Fehling’s B solution and Benedicts solution. Both Fehling’s and Benedict’s solutions are a reagent used to differentiate aldehydes from ketones and used for detecting reducing sugars. Your group was asked to make 120 ml of each solution. Show your complete solution.

Preparation of Fehling's solution A:
Dissolve 35g of Cu2SO4.7H2O in water and make up to 500ml
Preparation of Fehling's solution B:
Dissolve 120 g of KOH and 173 g of Sodium Potassium Tartrate (Rochelle salt) in water and make up to 500 ml

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

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