Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
-----------------
hydrogen peroxide : H2O2
hydrochloric acid : HCl
sodium sulfide : Na2S . 3H2O
Class:
------
elem=S,O
redox
Summary:
--------
Sodium sulfide is oxidized by acidic hydrogen peroxide with extreme violence.
Description:
------------
Make a mix of approximately equal volumes of HCl (30%) and H2O2 (appr. 30% by
weight): The liquid is clear and colorless, no gas is evolved.
Add a scale of solid sodium sulfide (yellow solid, technical quality): The
solid starts fizzling as soon as it hits the liquid. After a second, however,
it reacts with extreme violence and immediately dissolves, forming a milky
pale yellow 'blob' in the liquid, which sinks to the bottom. When the liquid
is shaken, it becomes milky light yellow.
There is a fairly strong smell of H2S.