what test can be carried out to identify each gas? Hydrogen, Oxygen, Carbon Dioxide, Ammonia and Chlorine?

Question

state the test and expected results please?

Answer 1

hydrogen - 'squeaky pop' test - if there is a pop H2 is present

oxygen - Put a glowing splint into possible source, oxygen will re-ignite it

CO2 - Add CO2 into lime water and if CO2 is present it will turn milky

Cl - Bleaches litmus paper

@Mel : Imitation is the finest form of flattery =)

Answer 2

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You are nearly correct in them. Be careful over the difference between 'burning' and 'glowing' splints. Hydrogen - burning splint - squeaky pop Carbon dioxide - lime water goes cloudy. (The splint going out is NOT a test for Carbon Dioxide. This test just tells you there is not enough oxygen to support combustion. The split would go out in Nitrogen, ammonia etc as well as Carbon Dioxide) Oxygen - glowing splint - reignites.

Answer 3

Hydrogen: A lit splint held to an inverted test-tube of gas.Hydrogen will burn with a squeaky pop!
Oxygen: Place a glowing splint into a test-tube of unknown gas- if the splint relights, you have tested for oxygen.
Carbon Dioxide:you will require LIME WATER. (Calcium hydroxide in water) bubble the gas through the lime water, carbon dioxide will turn the lime water white/ milky. This is due a white precipitate called calcium carbonate BUT if more carbon dioxide is bubbled through, the precipitate "disappears". (The calcium carbonate reacts with more carbon dioxide to form calcium hydrogen carbonate which is soluble in water.)
Ammonia: test using ammonia and water solution and concentrated hydrochloric acid. A white smoke is produced. This is tiny particles of ammonium chloride.
Chlorine: The test is to place a piece of damp litmus paper into a tube of the unknown gas, if the paper is bleached, you have tested for chlorine. For safety reasons please ensure that this test is carried out in a fume cupboard!!

Answer 4

Test For Oxygen Gas

Answer 5

*...Hydrogen.. In a test-tube, when a burning splint is placed at the mouth, a distinctive "POP !" is heard as the Hydrogen ignites explosively.

*...Oxygen.. Again, in a test-tube, a GLOWING splint placed into the tube will re-ignite.

*...Carbon Dioxide will extinguish a lighted splint.
Also, a chemical called 'Hydrazine hydrate' is used in testing for CO2. When the chemical absorbs CO2, the reaction shows as a blue colour.
Bubbling CO2 into Lime water will produce a white precipitate of Calcium Carbonate.

*… Ammonia has a very pungent smell …Smelling salts.
It will turn moist red litmus and moist universal indicator paper blue, and it will extinguish a lighted splint.
Specific test: - Dip a glass rod into Hydrochloric acid and place it over the Ammonia…a white vapour of Ammonium chloride, (NH4Cl) is produced. .

*…Chlorine is green-yellow in colour and causes irritation to the mucous membranes of the nose and throat.
It will turn moist litmus or universal indicator paper red, and then BLEACH it white.
It will also put out a lighted splint.

Answer 6

Hydrogen will extinguish a lighted wooden splint, with a squeaky pop.

Oxygen will relight a glowing splint.

Carbon dioxide turns limewater cloudy/white.

Ammonia is the only common alkaline gas - turns moist red litmus paper blue. You can also bring the stopper from a bottle of concentrated hydrochloric acid to the ammonia and you get dense white fumes of ammonium chloride.

Chlorine will turn moist blue litmus paper red and then very quickly bleach it white.

Answer 7

Hydrogen-"pop test"
Oxygen-will re-ignite a glowing splint
Carbon Dioxide-will turn lime water cloudy/milky
Chlorine-bleaches litmus paper
Ammonia-i know that hydrochloric acid is used but i can't remember it.

Answer 8

Most of the people got them right...But to get the results for litmus test one should wet (with distilled water) the litmus paper to allow the dissolution of the gas!! (Nobody mentioned this practical point)

H2 --> pop test: place the flame in a test tube full of Hydrogen
02 --> relights glowing splint: insert a glowing splint in tested environment
CO2 --> limewater milky: bubble the questioned gas through limewater
Ammonia--> Litmus Blue: wet a litmus paper in distilled water and after expose to the investigated gas
Chlorine --> Bleaches Litmus: wet a litmus paper and introduce it in the unknown gas.

Answer 9

The splints for the hydrogen and carbon dioxide tests would be burning rather than glowing, but apart from that you are right.

Answer 10

Hydrogen, burns with a pop (when you insert flame)

Oxygen - insert a glowing splint and it will re-ignite

Answer 11

i only know hydrogen: its called the pop test, you get some of the gas you want to test in a test tube which you hold upsode down
then put a match under the test tube and if it pops, its hydrogen!