Sodium Thiosulfate and Copper Reaction: Chemistry, Products, and Observations

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When sodium thiosulfate and copper react, the following reaction occurs:

$$2Na_2S_2O_3 + 2CuSO_4 \rightarrow Cu_2S + 3Na_2SO_4 + S$$

In this reaction, sodium thiosulfate acts as a reducing agent and reduces copper sulfate to copper sulfide, which forms a black precipitate. Sodium sulfate is formed as a byproduct of the reaction.

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