Identifying products version 2 Flashcards
what is the method for flame tests
dip nichrome wire in acid to clean
dip loop in substance being tested
put substance in blue flame
observe colour
in a flame test what colour do lithium ions go
crimson red
in a flame test what colour does sodium ions go
orange yellow
in a flame test what colour do potasium ions go
lilac
in a flame test what colour do calcium ions go
orange red (brick red but dont say brick red)
in a flame test what colour doe coper ions go
green/blue
what is the test for aqueous metal ions
add sodium hydroxide to solution
metal hydroxide forms - some are insoluble(precipitates)
what colour precipitate will aqueous iron(II) make
green
what colour precipitate will Iron (III) make
brown - orange
what colour precipitate will calcium 2+ make
white
what colour precipitate will zinc 2+ make
what is the test for carbonate ions
add dilute acid to the solution or substance
CO2 released
bubbles produced
Bubble the gas into lime water turns cloudy if CO2 present
test for sulfate ions
bairum ions react with sulfate ions to produce a white precipitate
add HCL to solution
add dilute barium chloride - white precipitate will form if sulfate ions are present
why is HCL added to the solution when testing for sulfate ions
why is it not sulfuric acid
HCL is added to reacts with any carbonate ions because carbonate ions reacts with barium chloride to make a white precipitate so HCL removes any carbonate ions present
No Sulfuric acid because then sulfate ions have been added to the solution so a false positive result will occur
what is the test for halide ions
add drops of nitric acid (reacts with any carbonate ions because carbonate produces a white precipitate with silver nitrate)
add silver nitrate
