Analysing Gases

Edited by Jamie (ScienceAid Editor), Taylor (ScienceAid Editor), SmartyPants

Ad

Methods of Collection

  1. 1
    Over Water
    .
    One way for gasses to be collected is over water, but this can only be done with gasses that are insoluble or just slightly soluble in water, otherwise they would dissolve and you wouldn't be able to collect them. For example: carbon dioxide, oxygen, and hydrogen. For this method, a container is filled with water, a test tube is also partially filled with water and inverted and submerged in the water - it remains full. A pipe is put under the test tube, and as gas bubbles up into the test tube, it forces water from it; so that the gas is collected in the tube.
    the collection of gas over water
    Advertisement
    Was this step helpful? Yes | No| I need help
  2. 2
    Displace Air
    .
    Another, more simple method, is to displace air rather than water. If the gas has a density lower than that of air, it can be collected by upward delivery. If on the other hand, the gas has a density higher than air, it must be collected by downward delivery, or it will escape.
    collection of gas by upward and downward delivery
    Was this step helpful? Yes | No| I need help
  3. 3
    Syringe
    .
    The next method of collection is the gas syringe. It's not only for collecting gasses, but also for measuring the volume of the gas collected.
    Was this step helpful? Yes | No| I need help
    Advertisement

Testing

Gas Testing Method
Hydrogen

H2

Collect gas

Put in a burning match. It will pop.

Oxygen

O2

Collect gas.

Put in a glowing match. It will reignite.

Carbon Dioxide

CO2

Bubble gas through lime water (CaOH).

The water will turn cloudy.

Sulphur Dioxide

SO2

Collect gas.

Bubble through orange potassium dichromate solution. Solution turns green.

Hydrogen Chloride

HCl

Collect gas.

Mix with ammonia gas. Forms dense white fumes.

Ammonia

NH3

Collect gas

Add damp red litmus paper. Paper turns blue.

Referencing this Article

If you need to reference this article in your work, you can copy-paste the following depending on your required format:

APA (American Psychological Association)
Analysing Gases. (2017). In ScienceAid. Retrieved Jul 20, 2017, from https://scienceaid.net/chemistry/applied/gases.html

MLA (Modern Language Association) "Analysing Gases." ScienceAid, scienceaid.net/chemistry/applied/gases.html Accessed 20 Jul 2017.

Chicago / Turabian ScienceAid.net. "Analysing Gases." Accessed Jul 20, 2017. https://scienceaid.net/chemistry/applied/gases.html.

If you have problems with any of the steps in this article, please ask a question for more help, or post in the comments section below.

Comments

ScienceAid welcomes all comments. If you do not want to be anonymous, register or log in. It is free.

Article Info

Categories : Applied

Recent edits by: Taylor (ScienceAid Editor), Jamie (ScienceAid Editor)

Share this Article:

Thanks to all authors for creating a page that has been read 553 times.

Do you have a question not answered in this article?
Click here to ask one of the writers of this article
x

Thank Our Volunteer Authors.

Would you like to give back to the community by fixing a spelling mistake? Yes | No