Qualitative Analysis Photos


Chromic Acid Test


Addition of Chromic Acid Reagent to 1, 2 & 3 alcohols



Left to right: 1 alcohol, 2 alcohol & 3 alcohol




***Note: Appearance of green color indicates presence of a primary or secondary alcohol. Aldehydes also produce positive results with this test.



Ferric Chloride Test



Left to Right: Hydrocarbon and Phenol reacted with 1% FeCl3




***Note: Formation of red color indicates positive results and therefore the presence of an aromatic compound.



Iodoform Test

Reaction with KI3


Left to right: methyl ketone, 2-butanol and alkane


***Note: Formation of pale yellow precipitate indicates positive test for the presence of methyl ketones.  2-Butanol is oxidized to 2-butanone which is a methyl ketone.  Therefore, it will also produce a pale yellow precipitate if a lot of KI3 is added.

Left to right: Cyclohexanone, 1-butanol and butanal


*** Note: No iodoform precipitation



2,4-Dinitrophenylhydrazine Test




Left to right: aldehydes, ketone and amine


***Note: Orange precipitate indicates positive test for aldehydes and ketones while yellow solution indicates negative test



Hinsberg Test


Left to right: 1 amine, 2 amine & 3 amine


1 amine reacted with HCl


***Note: Primary and secondary amines produce soluble and insoluble precipitates respectively while tertiary amines produce no precipitate.



Silver Nitrate Test


Left to right: alkyl halide and carboxylic acid


***Note: Formation of white, insoluble precipitate indicates positive results for the presence of and silver halides.



Lucas Test


Left to right: 1 alcohol, 2 alcohol & 3 alcohol immediately after addition of Lucas Reagent

 2 minutes after addition of Lucas Reagent



5 minutes after addition of Lucas Reagent



***Note: Primary alcohols do not turn cloudy, secondary alcohols turn cloudy after 2-5 minutes and tertiary alcohols turn cloudy instantly with addition of Lucas Reagent



Bromination Test


Left to right: cycloalkane and cycloalkene


***Note: Rapid disappearance of bromine color indicates the presence of an alkene




Potassium Permanganate Test


Left to right: cycloalkene and aromatic compound


***Note: Formation of brown precipitate indicates the presence of carbon-carbon double bonds.