Chemical tests Flashcards
Ammonia test + result
Damp red litmus paper
- Turns blue
ammonia appereance of test
colorless, pungent smell
carbon dioxide test and results
bubble though lime water
- lime water turns milky/ cloudy
C02 appereance test
colorless and odorless
chlorine test and result
damp blue litmus paper
- paper is bleached
chlorine apperence in test
pale green, choking smell
hydrogen test and result
hold a lighted splint in mouth of test tube
- burns with a squeaky pop sound
hydrogen appearance test
colourless and odourless
oxygen test and result
hold a glowing splint
-splint relights
oxygen appearance test
colourless and odourless
why is flame test neccasary
identify metal ions by the color of flame they produce
how to carry out a flame test
- dip loop of an unreactive wire (eg. nichrome) in conc. acid
- hold it in blue flame of bunsen burner until no color change
- dip loop into solid sample and place it on the edge of the blue bunsen flame
Li+
red
Na+
yellow
K+
lilac
Ca2+
orange-red
Cu2+
blue- green
what is the test for cations
place metal cations in aq solution to identify what color precipitate they form
Copper (II)
light blue ppt formed
Iron (II)
green ppt formed
Iron (III)
red-brown ppt formed
Carbonate test
add dilute HCL and test the gas released
Carbonate result
effervescence
- gas produced CO2
- co2 test
Chloride test
acidify with nitric acid and add aq silver nitrate
chloride result
white ppt formed
bromide test
acidify with nitric acid and add aq silver nitrate
Bromide result
cream ppt formed
iodide test
acidify with nitric acid and add aq silver nitrate
iodide result
yellow ppt formed
sulfate test
acidify with nitric acid and add aq barium nitrate
sulfate result
white ppt formed
chemical test for water
anhydrous copper (II) sulfate turns from WHITE to BLUE
