Flashcards in Organic Analysis Deck (10):
what reagent could you use to test a sample of alcohol to find out whether it was a tertiary secondary or primary alcohol?
acidified potassium dichromate
add 10 drops of alcohol warm and wait for colour change
primary - orange turns to green as aldehyde forms
secondary - orange turns to green as ketone forms
tertiary - nothing happens
describe how you can use benedict's solution to find out if a solution is an aldehyde or ketone
1. add 2cm3 of benedicts solution to test tube
2. add 5 drops of the aldehyde or ketone to the test tube
3. place in hot water bath for a few mins
aldehyde - blue solution gives brick red precipitate
ketone - nothing happens
which three solutions do you need to mix to create tollens reagent?
dilute sodium hydroxide
describe how you would test a sample to find out weather it was a alkane or alkene
add solution to test tube
add bromine water to test tube and shake
alkenes - orange to colourless
alkanes - nothing happens
name the gas produced when a carboxylic acid reacts with sodium carbonate
in mass spectrometry, what is meant by a molecular ion?
a molecular ion is when a molecule looses an electron
explain how you could find the molecular mass of a compound by looking at its mass spectrum
if the value of the m/z value is 72 so must be the Mr
if you calculate the Mr for the first few straight chain alkanes you will find that it is pentane
which parts of a molecule absorb infrared radiation?
on an infrared spectrum, what is meant by the fingerprint region?
the region between 500 and 1500 cm-1