Organic Tests Flashcards
(26 cards)
What’s the test for primary/secondary alcohol
Potassium dichromate
Goes orange to green
What’s the 2 tests for aldehydes?
-Tollens Reagent (silver mirror forms)
-Fehlings solution (blue to red)
What does Iodoform test for?
Ketones or ethanal
What’s the test for Ketones
Iodoform test
- add iodine solution then sodium hydroxide solution
- pale yellow ppt forms
What’s the test for carbonyl compounds
Brady’s reagent ( 2,4 DNPH)
- yellow, orange or red/orange ppt forms
- ppt can be recrystallised to find melting point to identify which carbonyl
Why can carbonyls be easily identifies using their melting points
They have sharp melting points
What’s a test for esters
Add a carbonate compound and it will fizz
What is the colour of iodine as a gas
Purple
What is the colour of iodine as a solid?
Grey/black
What colour solution does chlorine form?
Pale green or colourless
What colour solution does bromine form
Yellow
What colour solution does iodine form?
Brown (sometimes black precipitate)
What colour solution does iodine form?
Brown solution (sometimes black solid)
What colour solution does iodine form?
Brown solution (sometimes black solid)
What colour is bromine gas?
Deep red-brown
What colour lithium in the flame test?
Red
What colour is sodium in a flame test?
Yellow
What colour is potassium in a flame test?
Lilac
What colour is magnesium in a flame test
White
What colour is calcium in a flame test
Brick red
What colour is strontium in a flame test
Crimson
What colour is barium in a flame test
Pale green
What’s the test for halide ions
Add HNO3 then AgNO3 and a precipitate will form.
For further test add ammonia (iodine don’t dissolve, bromide in conc, and chloride in dilute
What’s the test for ammonium
Add sodium hydroxide and it will turn red litmus paper blue
