The above chemical equation shows the reaction between copper(II) sulfate (CuSO4) and sodium thiosulfate (Na2S2O4) to form CuS2O4 (a compound that does not exist in chemistry) and sodium sulfate (Na2SO4).
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Reaction conditions: The reaction usually occurs in a mildly acidic environment and at room temperature.
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Reaction process: Specifically, CuSO4 (copper sulfate) reacts with Na2S2O4 (sodium thiosulfate) to form a non-existent compound and Na2SO4 (sodium sulfate).
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Phenomena occurring: In fact, this equation is not accurate. The reaction between CuSO4 and Na2S2O4 will yield Cu2S (copper sulfide) and Na2SO4:
CuSO4 + Na2S2O3 -> Cu2S + Na2SO4
In this reaction, you would see the mixture change from the blue color of CuSO4 to the black color of Cu2S.