Test For Stuff Flashcards
What are the flame tests colours?
Lithium= red
Sodium= yellow
Potassium= lilac
Barium= apple green
Calcium= brick red
Copper= blue/green
How do you test for ammonia and what are the results?
Heat up the substance and hold damp blue litmus paper to the gas. In the presence and of ammonia gas, it will turn red
What do you add to test for transition metals and what are the results
You add NaOH
Fe2+= green
Fe3+= brown
Cu2+= blue
Mg2+= white
Al3+= white
Pb2+= white
How do you distinguish between Al3+ and Mg2+?
It dissolves in excess of
How do you know if Pb2+ —> I-?
There is a bright yellow ppt
How do you test for NO3- and what are the reulsts?
You are Devarda’s alloy, NaOH and heat and it forms NH3 which you then test with damp blue litmus paper
What is the test for hydrogen?
SQUEAKY POP TEST!!! (Lit flame)
How do you test for oxygen?
Relights a glowing splint
How do you test for CO2
You bubble it through limewater and in the presence of CO2 and it turns cloudy
How do you test for Cl2 gas?
It bleaches damp red litmus paper to
How do you test for alkenes/ unsaturated carbon chains?
Add bromine water and it will go from brown to colourless
How can you tell the difference between carboxylic acid and phenol?
Only carboxylic acids react with sodium hydrogen carbonate
How do you test for phenol?
Add iron (III) chloride which goes from yellow to purple
How do you test for aldehydes?
Add H2SO4 and K2Cr2O7 and heat and it will go from orange to green
What are you testing for woth Fehling’s solution and what are the results?
Aldehydes and when adding A+B and heat, it will turn red
What are you testing for when adding Tollen’s solution and what else do you add and what are the results?
You will also add NaOh, AgNO3, NH4OH and heat and a silver mirror will form
How do you test for water?
Blue to pink cobalt chloride paper
How do you test for halogens and what are the results?
And HNO3 and AgNO3
Chlorine= white ppt that dissolves in dilute ammonia
Bromine= cream ppt that dissolves in dilute ammonia
Iodine= yellow
How do you test for starch?
Add iodine which turns from black to blue
How do you test for SO42- ions?
Add Ba2+ which forms white ppt
