Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
sodium sulfite : Na2SO3
formic acid : HCOOH
potassium permanganate : KMnO4
Class:
------
elem=Mn
redox
Summary:
--------
Permanganate is capable of oxidizing formic acid quickly, itself being
reduced to manganese (IV). Sulfite is needed to bring the manganese to
the +2 oxidation state.
Description:
------------
Add some solid KMnO4 to HCOOH (85% by weight): Immediate violent reaction.
A lot of a colorless gas is produced. If the reaction is completed, then the
liquid is turbid and dark brown, almost black.
Add some of a solution of Na2SO3 in water: The liquid slowly turns lighter
and clearer. After approximately 30 seconds, the liquid is clear and
colorless.