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Endothermic solid-solid reactions

Description

In this demonstration you can observe an endothermic reaction. Solid hydrated barium hydroxide is mixed with solid ammonium chloride in a beaker. The liquid produced evolves ammonia gas and the temperature drops dramatically to about -20 °C.

Type of Activity

:
demonstration, class practical

Audience

:
Teacher

Age Group

:
11 to 18 years

Credits

:
This is an experiment from the Practical Chemistry project, developed by the Nuffield Foundation and the Royal Society of Chemistry.
endothermic-solid-solid-r...



Apparatus Chemicals

One demonstration will require:

Eye protection: goggles

Beaker (100 cm3)

Watch-glass

Thermometer, reading to -30 °C (Note 1)

Top-pan balance

Fume cupboard (optional)

Barium hydroxide-8-water (CORROSIVE), 32 g

Ammonium chloride (HARMFUL), 10 g

Concentrated hydrochloric acid (CORROSIVE)

Universal indicator (or litmus) paper, 1 strip

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

 






 



In this demonstration you can observe an endothermic reaction. Solid hydrated barium hydroxide is mixed with solid ammonium chloride in a beaker. The liquid produced evolves ammonia gas and the temperature drops dramatically to about -20 °C.

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