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Catalysts for the thermal decomposition of potassium chlorate

Description

Potassium chlorate(V) is heated and the time noted for enough oxygen to be produced to light a glowing splint. This is repeated using oxide catalysts noting the reduced time for the evolution of oxygen.

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
catalysts-for-the-thermal...



Apparatus Chemicals

Face shield and safety screens

Each demonstration requires:

Pyrex test-tubes (150 mm x 15 mm), 3 (One for each catalyst to be shown plus one for the control) (Note 1)

Bunsen burner

Retort stand with boss and clamp

Filter funnel

Conical flask (1 dm3) to collect filtrate

Watch glass, a little larger than the filter paper

Stopwatch or stopclock

Top pan balance (2 d.p.)

Oven

Wash bottle of deionised water

Filter paper (e.g. Whatman no.1)

Wooden splints

Mineral wool (optional)

Potassium chlorate(V) (OXIDISING, HARMFUL), 5 g. This is enough to demonstrate one catalyst plus a control. A further 2.5 g is needed for each additional catalyst.

You need 0.25 g of each catalyst.            Suitable catalysts include (Note 2):

copper(II) oxide (HARMFUL, DANGEROUS FOR THE ENVIRONMENT);

manganese(IV) oxide (HARMFUL);

iron(III) oxide (ferric oxide)

silicon dioxide (silica gel)

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

 







Potassium chlorate(V) is heated and the time noted for enough oxygen to be produced to light a glowing splint. This is repeated using oxide catalysts noting the reduced time for the evolution of oxygen.

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.