Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
ammonia : NH3
hydrogen peroxide : H2O2
cobalt chloride : CoCl2.6H2O
Class:
------
elem=Co
coordination
redox
Summary:
--------
Cobalt (II) appears to react with ammonia, but only when an oxidizer
is available. The resulting compound has an intense color.
Description:
------------
Dissolve some CoCl6.6H2O in a 3% solution of H2O2: The solid dissolves and
the liquid turns pink. The color is the same as when the cobalt chloride is
dissolved in plain water.
Add some NH3 (15% by weight): Vigorous foaming of the liquid, it almost
goes out of the test tube. The temperature of the liquid slightly increases,
it becomes luke-warm. The liquid turns dark red/brown.
Heat the liquid and add a little more H2O2 (3%): Liquid remains dark red/
brown and a lot of oxygen is evolved.