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Test for oxygen using glowing splint

Chemical analysis • Identification of common gases

Key concepts

What you'll likely be quizzed about

  • Oxygen is a colourless, odourless gas that supports combustion.
  • The test relies on the principle that more oxygen leads to faster combustion.
  • A glowing ember receives additional oxygen, which accelerates oxidation and produces a visible flame.

Flashcards

Test your knowledge with interactive flashcards

Why is a dry test tube recommended for collection?

Click to reveal answer

Dry collection avoids dilution of gas and prevents steam or condensation affecting the result.

Key notes

Important points to keep in mind

A glowing splint relighting into a flame indicates oxygen presence.

The test provides a qualitative result, not a concentration measurement.

Use a well-glowing ember, not an active flame, to insert into the gas sample.

Avoid contaminated or wet apparatus to reduce false results.

Keep the area clear of flammable materials and wear eye protection.

Very small gas volumes can give false negatives due to insufficient oxygen.

Oxidising contaminants can cause false positives; use controls when possible.

Extinguish and dispose of splints safely after testing.

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