Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
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iodic acid : HIO3
Class:
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elem=I
redox
Summary:
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Iodic acid, when heated, first gives off water vapor. When the resulting solid
is heated much stronger, then purple clouds of iodine appear and finally, all
solid is gone.
Description:
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Put some solid iodic acid in a clean and dry test tube and carefully heat the
test tube: Water vapor is formed. This can be seen as small droplets of water
in higher cooler parts of the test tube.
Heat much stronger: The solid completely decomposes and iodine and oxygen are
formed. Deep purple iodine vapor is formed, which forms nice crystals in higher
and cooler parts of the test tube. On prolonged heating, finally no solid
remains at all.