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Exhibition Chemistry: A spectacular reversible reaction

Description

When concentrated hydrochloric acid is added to a very dilute solution of copper sulfate, the pale blue solution slowly turns yellow-green on the formation of a copper chloride complex. When concentrated ammonia solution is added,  smoke is produced, heat is generated and the yellow-green complex turns into a very dark blue copper ammonia complex.

Type of Activity

:
demonstration

Audience

:
Teacher

Age Group

:
14 to 18 years
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ADDITIONAL INFORMATION