Steven Joseph
Chem 111
Eli Munoz
3 October 2016
Chemistry Technical Abstract: The Copper Cycle Steven Joseph*, Christian Contreras Introduction: This experiment consisted of studying the copper cycle. Along with its overall significance to biological systems, reactions were done in order to test the types of reaction types associated with copper. In addition, vacuum filtration methods and detailed observations were taken on how copper reacts with different chemicals as it is constantly heated and mixed. Towards the end of the experiment the remaining amount of copper is eventually recovered and analyzed. Materials and Methods: The most important part of the experiment as a whole was of course completing the copper cycle successfully. To …show more content…
In step two NaOH or sodium hydroxide was mixed in with the solution along with 10mL of distilled water. The important thing here is to grab a piece of litmus paper and add a drop of the completed solution to the paper to ensure it turns blue. In this step it was important to remember to add the solution drop wise or else the results of the experiment could vary in a drastic fashion. Step three involved simply heating the solution while stirring the solution with a magnetic stir rod. After about 5 minutes add 10mL of distilled water and then add only 9mL of 3 M H2SO4 drop by drop in order to allow the solution to cool down. As soon as the color changes, then stop adding the H2SO4. In step 5, collect 300mg of mesh zinc and add 5mL of distilled water. As the reaction slowly mixes with the stir bar, start adding the zinc very slowly. After this reaction is complete and the observations are recorded, make sure to add hydrochloric acid in order to ensure that there is no excess …show more content…
This is a metathesis reaction or double displacement reaction. This is the first reaction that was carried out in the lab. For the reaction of copper and nitric acid, it was seen that the solution turns blue as a result of stirring and heat. The balanced equation is Cu(s) + 4HNO3(aq) ---> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l). The next reaction that was carried out was that NaOH added to that particular solution. This was the longest reaction and probably was written properly as Cu(NO3)2(aq) +NaOH(aq) –> Cu(OH)2(s) + NaNO3(aq). This was another double displacement reaction, but instead of it being a gas formation like the previous one it was more of a precipitation reaction because a solid ended up forming. It was observed that the color of the solution turns green and then to blue as it was heated. The balanced equation for this is Cu(NO3)2(aq) +2NaOH(aq) –> Cu(OH)2(s) + 2NaNO3(aq) The next reaction that was carried out was CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l). This was another metathesis reaction in which an acid-base reaction took place. Once the sulfuric acid is added, it was observed that the color of the product turns a clear blue. The above reaction is already balanced at this point. At this point the zinc was added to the solution and the reaction was CuSO4(aq) + Zn(s) ---> Cu(s) + ZnSO4(aq). The solution turns darker after adding the zinc, most likely because of
Chem 111
Eli Munoz
3 October 2016
Chemistry Technical Abstract: The Copper Cycle Steven Joseph*, Christian Contreras Introduction: This experiment consisted of studying the copper cycle. Along with its overall significance to biological systems, reactions were done in order to test the types of reaction types associated with copper. In addition, vacuum filtration methods and detailed observations were taken on how copper reacts with different chemicals as it is constantly heated and mixed. Towards the end of the experiment the remaining amount of copper is eventually recovered and analyzed. Materials and Methods: The most important part of the experiment as a whole was of course completing the copper cycle successfully. To …show more content…
In step two NaOH or sodium hydroxide was mixed in with the solution along with 10mL of distilled water. The important thing here is to grab a piece of litmus paper and add a drop of the completed solution to the paper to ensure it turns blue. In this step it was important to remember to add the solution drop wise or else the results of the experiment could vary in a drastic fashion. Step three involved simply heating the solution while stirring the solution with a magnetic stir rod. After about 5 minutes add 10mL of distilled water and then add only 9mL of 3 M H2SO4 drop by drop in order to allow the solution to cool down. As soon as the color changes, then stop adding the H2SO4. In step 5, collect 300mg of mesh zinc and add 5mL of distilled water. As the reaction slowly mixes with the stir bar, start adding the zinc very slowly. After this reaction is complete and the observations are recorded, make sure to add hydrochloric acid in order to ensure that there is no excess …show more content…
This is a metathesis reaction or double displacement reaction. This is the first reaction that was carried out in the lab. For the reaction of copper and nitric acid, it was seen that the solution turns blue as a result of stirring and heat. The balanced equation is Cu(s) + 4HNO3(aq) ---> Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l). The next reaction that was carried out was that NaOH added to that particular solution. This was the longest reaction and probably was written properly as Cu(NO3)2(aq) +NaOH(aq) –> Cu(OH)2(s) + NaNO3(aq). This was another double displacement reaction, but instead of it being a gas formation like the previous one it was more of a precipitation reaction because a solid ended up forming. It was observed that the color of the solution turns green and then to blue as it was heated. The balanced equation for this is Cu(NO3)2(aq) +2NaOH(aq) –> Cu(OH)2(s) + 2NaNO3(aq) The next reaction that was carried out was CuO(s) + H2SO4(aq) → CuSO4(aq) + H2O(l). This was another metathesis reaction in which an acid-base reaction took place. Once the sulfuric acid is added, it was observed that the color of the product turns a clear blue. The above reaction is already balanced at this point. At this point the zinc was added to the solution and the reaction was CuSO4(aq) + Zn(s) ---> Cu(s) + ZnSO4(aq). The solution turns darker after adding the zinc, most likely because of