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When an excess amount of sodium thiosulfate is combined with copper sulfate in water, the resulting product is:

1. Copper(I) sulfide
2. Copper thiosulfate
3. Sodium trithiosulfatocuprate(I)
4. Sodium dithiosulfatocuprate(I)

Correct answer: Sodium dithiosulfatocuprate(I)

Solution

The reaction between excess sodium thiosulfate and copper sulfate in water results in the formation of sodium dithiosulfatocuprate(I), which is a complex ion.

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