Organic Analysis Flashcards
How to test for oxygen?
Relights a glowing splint
How to test for hydrogen?
Makes a squeaky pop when a flame is present
How to test for Carbon dioxide?
When bubbled through lime water the lime water goes cloudy
Aldehyde
Tollen’s reagent forms a silver mirror after being gently warmed
Or
Fehling’s solution goes blue to red
How to test for a Carboxylic acid?
When reacted with sodium hydrogen carbonate it forms carbon dioxide which can be tested with lime water.
How to test for an Alcohol?
Potassium dichromate turns from orange to green for primary and secondary alcohols
Halide ions
Add nitric acid and then add silver nitrate which forms a white/cream/yellow ppt when a halide is present although not with fluoride ions
Alkene
Bromine water decolourises an alkene
How to test for a sulphate ion?
hydrochloric acid and then barium chloride which forms the insoluble salt barium sulphate
How to test for chlorine gas?
Bleaches damp litmus paper
How to test for ammonia gas?
Turns damp red litmus paper blue
How to test for carbonate ions?
React with an acid and it will produce C02 gas
