1. The problem statement, all variables and given/known data Cu(s) + 4 HNO3 (aq) Cu(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l) Cu(No3)2 + 2NaOH -------> Cu(OH)2 + 2NaNO3 Cu(OH)2→CuO + H2O CuO + H2SO4 -> H2O + CuSO4 CuSO4(aq) + Zn ( s) ------- ZnSO4 (aq)+ Cu(s) I carried out the follow reactions using copper as an inital product and my percent yield was higher than 100% but I've got some possible error sources. The aqueous solutions which could have possibly remained due to poor decantation are ZnSO4 and NaNO3 and because these substances have high boiling point, they would not be removed when drying the copper using a steam bath and their masses would have an effect? I feel that this is unlikely because we used four washes in which zinc sulfate and sodium nitrate are soluble. We used methanol and acetone washes right beofre drying the copper and perhaps methanol remained when weighing (because acetone is more volatile)? In addition, would the highest possible percent error be 2%?