Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
sodium sulfite : Na2SO3
potassium tetrachloro iodate (III) : KICl4
Class:
------
redox
elem=I,Cl
Summary:
--------
The tetrachloroiodide ion is not stable in water at high dilution. It
tends to disproportionate to iodine, choride and iodate.
With sulfite, it is reduced to iodine. With excess sulfite, it is reduced
to iodide.
Description:
------------
Dissolve some KICl4 in water: The liquid becomes light brown. On dilution,
this compound hydrolyses and disproportionates to iodine and iodate. The
chlorine goes in solution as chloride.
Add a small amount of solid Na2SO3: The solid dissolves, the liqud becomes
dark brown and solid pieces of iodine are separated from the liquid.
Add much more Na2SO3: The solid dissolves and the liquid becomes colorless.