Tests for Gases and Anions Flashcards
How do you test for chlorine ?
Chlorine bleaches damp blue litmus paper, but turning white. ( It may turn red for moment first though - that’s because a solution of chlorine is acidic)
How do you test for oxygen ?
If you put a glowing splint inside a test tube containing oxygen, the oxygen will relight the glowing splint.
How do you test for carbon dioxide ?
Bubbling carbon dioxide through ( or shaking carbon dioxide with) an aqueous solution of calcium hydroxide (know as lime water) causes the solution to turn cloudy.
How do you test for hydrogen ?
If you hold a lot split at the open end of test tube containing hydrogen, you’ll get a “squeaky pop”. ( The noise comes from the hydrogen burning quickly with the oxygen in the air to form H20
Do tests for anions often give precipitates ?
Yes
How do dilute acids help detect carbonates ?
Carbonates are substances that contain CO3^2- ions. You can test wethere a mystery solution contains carbonate ions by putting a sample j. a test tube and then using a dripping pipette to add a couple drops of dilute acid. You should the connect the test tube to a test tube of limewater. If carbonate through it ( as shown above).
How do you test for sulfates using HCL and barium chloride?
To identify sulfate ions ( SO4^2-) , use a dropping pipette to add a couple of drops of dilute hydrochloric acid followed by a couple of drops of barium chloride solution to a test tube containing your mystery solution. If sulfate ions are present, a white precipitate of barium sulfate will form.
How do you test for halide with nitric acid and silver nitrate ?
To identify a halide ion, add a couple drops of dilute nitric acid (HNO3) , followed by a couple of drops of silver nitrate solution, to your mystery solution.
