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Science 7–10 · Year 7

Ammonia and hydrogen chloride diffusing along a tube: the white ring

Solutions and mixtures

Teacher-led demonstrationPractical, model not builtHigh risk

Teacher-led demonstration

A teacher carries out this activity as a demonstration. Its materials, steps, variables, misconceptions and sources are not published on the open web, and neither is any result, control or note that states a number or an amount: tutors and administrators read them on the learning platform, with the safety card first. The idea, the hazards and the curriculum references are below.

Open the procedure on the learning platform (tutor or administrator sign-in)

School laboratory, not for home

In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.

This site has no interactive model of its own. Where a step or a material names a Concept Studio model, simulation or tool, it has not been built; an external simulation a step names (for example PhET) is not part of this site.

The idea

Gases diffuse at speeds set by their particle mass, so two gases released at opposite ends of a tube meet nearer the heavier gas.

Safety card

High riskTeacher-led demonstration

Setting: In a school laboratory, with a teacher supervising, under the school's risk assessment. Not for home.

Hazards

  • concentrated hydrochloric acid and concentrated ammonia are corrosive and give off choking vapours
  • ammonia bottle can be under pressure on warm days
  • ammonium chloride smoke irritates airways

Controls

At least one of them states a number or an amount, which may be part of the method, so the controls are shown with the method to tutors and administrators on the learning platform.

Note

It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.

What you should see

It states a number or an amount, which may be part of the method, so it is shown with the method to tutors and administrators on the learning platform.

Curriculum references

The NSW syllabus outcomes and Australian Curriculum v9 codes this activity supports. They are references, not a verified or complete curriculum alignment.

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