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3. Water was added to remove any underacted copper(II) sulfate, iron, and iron(II) sulfate. The solution was washed to isolate the copper.
4. The water added didn't matter if the measurement w for water was exact because it wasn't included in the reaction. Water was only used to wash the copper and help facilitate the reaction.
5. Fe+CuCO4->Cu+FeSO4 The formula for the iron-containing compound was FeSO4. The observations support this as the color of the copper(II) sulfate solution got darker, so it is iron(II) that was used. So, it would be Fe2++SO42-->FeSO4, making the formula FeSO4.
6. 95.2% Yield 119.42g-117.25g=2.17g (2.17/2.28)*100=95.2%
Conclusion: