methods to collect gas

Question 1

Method to Collect Gas

Answer 1

Displacement of Water, Displacement of Air, Using a Graduated Gas Syringe

Question 2

Examples of Gases Collected via Displacement of Water

Answer 2

Oxygen, nitrogen, carbon monoxide, carbon dioxide, and hydrogen

Question 3

Downward Displacement of Air (Upward Delivery of Gas)

Answer 3

Connect the delivery tube to an inverted test-tube for the gas to be collected.

This method is used to collect gases that are less dense than air (e.g. hydrogen, ammonia).

Question 4

Upward Displacement of Air (Downward Delivery of Gas)

Answer 4

Connect the delivery tube to a test-tube for the gas to be collected.

This method is used to collect gases that are denser than air (e.g. carbon dioxide, sulfur dioxide, chlorine, hydrogen chloride).

Question 5

Using a Graduated Gas Syringe

Answer 5

Gases can be collected in a gas syringe attached to a conical flask. The volume can be measured at r.t.p.

Question 6

Displacement of Water

Answer 6

This method is suitable for collecting gases which are insoluble or slightly soluble in water.

Question 7

Displacement of Air

Answer 7

This method is suitable for collecting any gas especially those which are very soluble in water.