GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
When an iron nail is immersed in a copper (II) sulfate solution (left panel), a single-displacement reaction occurs. Copper metal and iron (II) sulfate form as a result (Fe + CuSO4 -> Cu + FeSO4) and the solution colour changes from blue to green (right panel).
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