Chemical tests Flashcards
(18 cards)
How do you test for ammonia gas?
Heat the test solution and hold a piece of litmus paper at the mouth of the test tube, the damp litmus paper should go from red to blue if ammonia gas is present
How do you test for carbon dioxide?
Pump carbon dioxide gas into lime water, if present, the lime water should go from clear to a cloudy color
How do you test for chlorine?
Hold a damp litmus at the mouth of the test tube, if chlorine gas is present, the paper should go from blue to red and then to a bleached white
How do you test for hydrogen gas?
Hold a burning splint next to the mouth of the test tube, if hydrogen is present, there should be a squeaky pop that is heard
How do you test for oxygen?
Hold a glowing splint next to the mouth of the test tube, if oxygen is present, the splint should relight
What color does lithium burn like?
Red
what color does sodium burn like?
yellow
What color does potassium burn like?
Purple
What color does calcium burn like?
Orange-red
What color does copper burn like?
Green
How do you test if water is pure or not?
Boil the water and if the boiling point isn’t 100 degrees celsius then it isn’t pure
How do you test for Fe2+?
Add sodium hydroxide and you should see a pale green precipitate
How do you test for Fe3+?
Add sodium hydroxide and you should see a brown precipitate
How do you test for Cu2+?
Add sodium hydroxide and you should see a blue precipitate
How do you test for NH4 +?
Add sodium hydroxide and ammonia gas should be released. You can test for ammonia gas by holding a damp red litmus paper that turns blue
How do you test for CO3 2-?
-Add dilute acid
-Bubble the gas released through limewater
-Limewater turns cloudy if carbonate ions are present
How do you test for halide ions?
Add silver nitrate
Cl-: White precipitate
Br-: Cream precipitate
I-:Yellow precipitate
How do you test for sulfate ions SO4 2-?
-Add dilute hydrochloric acid
-Add Barium chloride
-A white precipitate should be formed
