Course Hero is not sponsored or endorsed by any college or university. In part B, the copper(II) nitrate solution reacted with, the base sodium hydroxide (NaOH) to create a light blue precipitate known as copper(II), hydroxide and the aqueous solution of sodium nitrate.
Copper was put through a series of several reactions, until solid copper was the last remaining product.
Rather, matter is shifted and converted into different states. Change ), You are commenting using your Twitter account. Oxidation/reduction reactions involve a change in oxidation number and a transfer of electrons. If the copper was not completely dry at the time of weighing, then the measured weight of recovered copper would include some water. In theory, the exact same amount of copper should have been recovered at the end of the experiment yielding a perfect 100% recovery, but that is usually not the case in lab situations. We also wanted copper to go through a. cycle in order to find its percent recovery after the chemical reactions it went through. If the washing was incomplete or inadequate, then the recovered material would include some zinc, and therefore have a higher mass. To test this law, copper can be put through a cycle to test if the same mass of copper is present at the end of the cycle. This is a lab report for my General Chemistry class. The purpose of this experiment is to observe the qualitative aspects of a series of reactions involving copper. Change ), Biology Post-lab Report (Studying Mitosis), Biology Post-lab Report (Yeast Phenotypes), Chemistry Lab Report (The Activity Series).
The first chemical reaction the Cu sample went through was reacting with, nitric acid (HNO3) in order to oxidize the Cu metal and create copper(II) nitrate aqueous, solution and to release nitrogen dioxide gas (which was a red-brownish color) from the test tube, where the Cu chemical reaction took place.
South Texas High School For Health Professions, South Texas High School For Health Professions • CHEM 1111, University of Texas, Rio Grande Valley • CHEM 1111, University of Texas, Rio Grande Valley • CHEM 1311, University of Texas, Rio Grande Valley • CHEM 1301, University of Texas, Rio Grande Valley • CHEMISTRY 1111. This sample would be the one to undergo a series of chemical reactions in order to find its, percent recovery.
Decanting occurred several times during this experiment, so losing a small amount of copper each time could have a larger effect on the recovery. It also shows my ability to recognize error and discuss how the error affects the outcome of the lab.
Possible sources of error that could inaccurately raise the mass of the recovered matter include incomplete washing of copper during the last step of the experiment, or incomplete drying of the copper solid before weighing. There are two possible ways errors could have affected this experiment.
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The percent recovery was 90.8%. Calculations: mass of recovered copper equals dish and copper minus dish. Learn vocabulary, terms, and more with flashcards, games, and other study tools. 1.Measure about 1g of solid copper.
The percent error in this experiment was 9.2%. ( Log Out /
Decomposition reactions yield a product that is a broken down form of the reactant, such as AB à A + B. Acid/base neutralization reactions involve the creation of water and a salt. Possible sources of error that could have led to a loss of copper most likely occurred during decanting. Introducing Textbook Solutions. Chem Lab Report 28 - Lab Report Experiment#28 Chemistry of Copper Objective The purpose of this experiment was to have copper undergo a series of, 8 out of 9 people found this document helpful, Lab Report: Experiment #28- Chemistry of Copper, The purpose of this experiment was to have copper undergo a series of chemical reactions in, order to observe the way it reacted with each chemical. The solid containing copper settled to the bottom, and the liquid was removed via decanting.
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Precipitation reactions yield a solid product that is insoluble. The Law of Conservation on Mass states that all matter is conserved; no matter can be created or destroyed. Percent error: [(0.500g – 0.454g) ÷ 0.500g] × 100 = 9.2%. Conservation Of Mass: A Cycle of Copper Reactions. This copper cycle consists of six different reactions and four different types of reactions.
Table 1: Measurements and calculations of mass, and calculation of percent recovery of copper after the experiment was completed.
After the six steps of the experiment, the same mass of solid copper should be recovered, based on the Law of Conservation of Mass.
Start studying Experiment 28 chemistry of copper.
The initial mass of copper was recorded, and then compared with the mass of recovered copper at the end of the experiment. Course Hero is not sponsored or endorsed by any college or university. First, errors could have inaccurately raise the mass of the recovered matter.
Cu(NO3)2(aq) – Red solid -> Brown gas + blue solution, Balanced Equation: Cu(s) + 4HNO3(aq) -> Cu(NO3)2(aq)+2NO2(g) + 2H2O(l), Cu(OH)2 (s) – Blue solution -> Muddy blue solid, Balanced Equation: Cu(NO3)2(aq) + 2NaOH(aq) -> Cu(OH)2(s) + 2NaNO3(aq), Balanced Equation: Cu(OH)2(s) -> CuO(s) + H2O(g), Balanced Equation: CuO(s) + H2SO4(aq) -> CuSO4(aq) + H2O(l), Copper (II) sulfate to copper metal – Blue solution -> Red solid + colorless solution, Balanced Equation: CuSO4(aq) + Mg(s) -> Cu(s) + MgSO4(aq), Balanced Equation: Mg(s) + H2SO4(aq) -> H2(g) + MgSO4 (aq), This textbook can be purchased at www.amazon.com.
This preview shows page 1 - 2 out of 2 pages. This particular lab report shows my ability to work with quantitative data, and analyze the calculations and measurements from the lab.…
( Log Out / The purpose of this experiment is to test the Law of Conversation of Mass. Procedure.
This is a lab report for my General Chemistry class.
The scientific law that was tested in this experiment is called the Law of Conservation of Mass. Solid copper is the first reactant in this experiment. Create a free website or blog at WordPress.com.
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