Description of experiment
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Needed compounds:
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sodium sulfide : Na2S . 3H2O
carbon disulfide : CS2
Class:
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elem=C,S
coordination
Summary:
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Carbon disulfide slowly reacts with an aqueous solution of sodium sulfide. The
resulting solution finally becomes deep orange.
Description:
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Add a few drops of carbon disulfide to a fairly concentrated solution of sodium
sulfide in water: Initially nothing special seems to happen. The drops of
carbon disulfide sink to the bottom and a blob of liquid is formed under the
aqueous layer.
Stopper the test tube and allow it to stand for a few weeks: Slowly the blob of
liquid disappears and it dissolves. While it does so, the color of the liquid
deepens from light yellow to beautiful deep orange. Finally, after a few weeks
all of the carbon disulfide has dissolved and a deep orange liquid is obtained.
This deep orange liquid must be a solution of trithiocarbonate ion, CS3(2-).