Description of experiment
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Needed compounds:
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sodium thiosulfate : Na2S2O3 . 5H2O
sodium hydroxide : NaOH
silver chloride : AgCl
Class:
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elem=Ag,S
coordination
Summary:
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Silver chloride and silver oxide dissolve in a solution of sodium
thiosulfate. The reaction is not very fast.
Description:
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Add a solution of NaOH to some solid AgCl: The white solid becomes brown.
Add an excess amount of sodium thiosulfate: Small brown particles quickly
dissolve. Larger pieces need more time to dissolve and become white before
they completely dissolve. Probably the larger particles of silver chloride
were only covered with an oxide layer at the outside and the interior was
unaffected silver chloride. The largest particles (appr. 1.5 mm radius) need
more than 30 minutes for complete dissolving.