required practical 6: tests for alcohols, aldehydes, alkenes and carboxylic acids Flashcards
1
Q
what is the test for an alkene
A
add bromine water to unknown and shake
alkene should decolourise bromine water
2
Q
test for an aldehyde
A
add tollens reagent to unknown
a silver mirror forms coating the inside of the test tube
ketones will have no change
add fehlings solution to unknown
colour change from blue to brick red
ketones do not react
3
Q
test for carboxylic acid
A
add sodium carbonate to unknown
carboxylic acids will fizz due to production of CO2
4
Q
test for alcohols
A
add acidified potassium dichromate and conc sulphuric acid
orange to green colour change
