Fehlings Solution No.1 Blue 1L
23508-1L

  DG9 Enviro toxin

Fehlings Solution No.1 (also called Fehlings A)

Code 23508

BLUE solution - Contains CuSO4

For the determination of reducing sugar in conjunction with Fehlings Solution No 2.

U.N Number 3082 ; DG Class 9 Enviro toxic ; Packing Group III (very low risk)

Fehling's test is a chemical analysis used to detect reducing sugars* eg glucse [ C6H12O6 ]. 

To use:-

Fehlings No.1 [or A])-a  Blue alkaline solution of C0PPER(II) sulfte

Fehlings No.2 [or B]) - a clear(or water white)solution of  potasium S0DIUM tartrte in s0dium hydrxide 

Mix equal parts of No1 (blue) and No2 (clear)

Add to the sample ( use the test solutions in proportion to the sample - so don't overwhelm a small sample with a large amount of test solution ) and heat in a water bath

If there is a brick red precipitate ( C0pper(I) 0xide) then a reducing sugar is present . No colour change, no reducing sugar..

Principle:  The aldehyde group is oxidized to a carboxylate ion, while the C0PPER(II) tartrte complex is reduced to insoluble C0PPER(I) oxide (red precipitate).

Reducing sugars - these have an aldehyde group - Main  examples -  gluc0se, fruct0se, galact0se ie all monosaccharides and some disaccharides (lact0se, malt0se)

Notable exceptions - Suc.rose( "sugar")

The net reaction between an aldehyde and the c0pper(II) ions in Fehling's solution may be written as: RCHO + 2Cu2+ ( c0pper(II) ions blue in colour) +5OH− ⟶ RCOO−  + Cu2O (C0pper(I) oxide red in colour )+3H2O

Where R is the alkyl chain and CHO is the aldehyde "tail" and COO the carboxylate group

Unit Qty: ea

Availability: 4.001 in stock