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Diffusion in liquids

Description

This class practical shows that diffusion takes place in liquids. Students place colourless crystals of lead nitrate and potassium iodide at opposite sides of a petri dish of deionised water. As they dissolve and diffuse towards each other they form clouds of yellow lead iodide.

Credits

:
This resource has been provided by, or developed in partnership with, Nuffield Foundation
diffusion-in-liquids



Apparatus Chemicals

Eye protection.

Per pair or group of students:

Petri dish

Forceps

White tile or piece of white paper

 

Lead nitrate (TOXIC, DANGEROUS FOR THE ENVIRONMENT), 1 crystal

Potassium iodide, 1 crystal

Deionised water

Refer to Health & Safety and Technical notes section below for additional information.

 


Read our standard health & safety guidance



A solid-solid reaction



This class practical shows that diffusion takes place in liquids. Students place colourless crystals of lead nitrate and potassium iodide at opposite sides of a petri dish of deionised water. As they dissolve and diffuse towards each other they form clouds of yellow lead iodide.

ADDITIONAL INFORMATION

This is a resource from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry. This collection of over 200 practical activities demonstrates a wide range of chemical concepts and processes. Each activity contains comprehensive information for teachers and technicians, including full technical notes and step-by-step procedures. Practical Chemistry activities accompany Practical Physics and Practical Biology.

The experiment is also part of the Royal Society of Chemistry's Continuing Professional Development course: Chemistry for non-specialists