Description of experiment
Below follows a plain text transcript of the selected experiment.
Needed compounds:
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zinc chloride anhydrous : ZnCl2
acetic anhydride : (CH3CO)2O
Class:
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elem=C
organic
Summary:
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When anhydrous ZnCl2 is added to acetic anhydride, then a (small) part of the
solid dissolves. On addition of a small amount of water, an extremely violent
reaction occurs, accompanied with crackling noise and violent bubbling of the
liquid.
Description:
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Add some solid ZnCl2 (anhydrous) to a small amount of acetic anhydride: The
solid only partially dissolves. The liquid becomes colorless.
Add a single drop of water: At first, nothing seems to happen, but after a few
seconds a crackling noise can be observed. After a few cracks, the reaction
stops.
Add a few more drops of water: A lot more crackling noise can be heard, the
liquid now start bubbling very violently and the liquid becomes really hot. The
sound is as if a lot of miniature explosions occur in the test tube. After the
reaction, all solid ZnCl2 is dissolved, the liquid is colorless.