When the solid CuO is reacted with sulfuric acid, the copper is returned to solution as an ion Cu2+. In our lab, this was not the case, and we ended up with approximately three and one half times the amount of copper we started with, According to the law previously stated, this is impossible. Then wash the filter paper with a small amount of deionized water. After sulfuric acid was added to the beaker, copper was found as copper ions with a 2+ charge instead of the previous copper ii oxide form. It is a forum for teens to express what is important to them and their community. Turn the vacuum on to remove the washing liquid.
Place penny into the beaker of nitric acid and observe the reaction. In our lab, we made sure to wear closed-toed shoes as well as goggles at all times. Record your observations in your notebook. High Not all the zinc was removed both as a soild and as ions dissolved in the solution Other Web Page by Alex Krzyston Alexanderjkrzyston. After vacuum filtration of Cu, we were left with shiny dark brown Cu metal of 0. There were many different sources of error throughout this lab, and I believe that this was the reason for such a significant difference between the initial and final masses and moles of copper that were calculated. The solution was swirled until all of the copper had dissolved.
Incomplete or incorrect information can lead to substantial penalties. We made sure not to touch the hotplate, and also to use tongs when picking up a hot beaker. Consult your instructor before removing the beaker from the fume hood. When the time came to evaporate the solution, the liquids disappeared, leaving behind a wet, brownish solid in the middle of the beaker. Hyun-Soo Seo Copper Cycle Lab Report Oxidizing the Copper to the Nitrate Back To Elemental Copper! Copper has many important uses due to its chemical and physical properties. The copper changed from a copper wire to a blue solution.
Observation: During each step, something happened. The last layer of test tube was still dark blue colored. Decantation errors could be avoided by employing filtration techniques instead of decantation technique. Also traces of acid may remain with the copper. The initial mass of copper used in the experiment was 2.
Caution: This reaction is initially vigorous. Copper is a good conductor of both heat and electricity, hence it can be found in electrical lines or on cooking pots. Reagent Appearance Benedicts Reagent Clear, Dark blue color solution. Make sure any large pieces do not contain unreacted Mg by breaking them up with the end of a stir rod. Copper was probably used around 8000 B. The most common natural ore is the sulphide, known as chalcocite, Cu2S. Dissolve the CuO by carefully pouring about 15 mL of 3 M sulfuric acid directly through the residue on the filter into a 250 mL beaker.
These reactions were conducted to display the several different states of… 1616 Words 7 Pages The Copper Basin of southeastern Tennessee is an area that is climatically unique with a rich history rooted in copper mining. After 5 more minutes it dries up but there was no specific color change and it remain yellow. This experiment is very dangerous because of the reactions between the strong acids and bases. Aim: My intention for this observation is to find out how the current has an effect on the mass of copper deposited in the electrolysis of copper sulphate and copper ii plates. Turn off hot plate and carefully remove the beaker with the forceps.
The Copper Cycle Alexes Montalvo Chem 1500-10 September 26, 2012 The Copper Cycle Introduction: The Copper Cycle is a popular experiment used to determine if an element, in this instance, copper, reverts to its elemental form after a chain of reactions. The percent yield of copper calculated was 341. First paragraph: The opening two sentences should express a reason and theme for the column. When the final mass of copper was weighed, the balance may have not been calibrated correctly, and the copper in the evaporating dish may have contained impurities, such as un-reacted zinc, that changed the mass that was measured. When the solid was hot, it bubbled and popped until it cooled down. During the next step, error may have occurred if there was copper precipitate left on the side of the beaker instead of washed with water.
Copper is an element that can be found in nature in a variety of different compounds. If you choose to handwrite any part of the report, you must do so legibly in ink. The reaction slows down as it goes, due to the loss of reactant and may take close to 30 minutes to go to completion. Allow the copper metal to settle to the bottom of the beaker. The ascorbic acid is white inn color and is powdery. After this knowledge was obtained, one can conclude that the zinc ions were washed out with the water during the final step.
We started with a small amount of cooper powder in a beaker, and added nitric acid to it while the beaker was under a fume hood. When a base was added later, it merely replaced the acid with the base. Once I put the sulfuric acid in it, the brown solids copper oxide slowly dissolved and turned the acid into blue. If you need to do any of these things to dissolve your copper, you should have a description of what you do in your lab notebook, including the amount of additional reagent added, if any. Take a little more reagent than you think you'll need in case of spills and in case you need a little extra for your reaction.
