Photosynthesis Lab Report

13) When the tray is thoroughly dry, determine its mass. Record the mass in the data table. You have to wait until day three to weigh the copper.

Washing of the copper is necessary in this experiment to separate the iron from the copper and make sure the iron is not counted in the mass of the copper.

XIV. Record your observations of the dried, cooled copper metal and weigh the recovered copper.

Aqueous 3.0 molar ammonia was added, turning the solution a dark blue and forming a blue precipitate. The test tube was centrifuged for one minute to separate the solid from the liquid. The solid was saved and the liquid was placed into a clean test tube. To the solution, five drops of aqueous 6.0 molar nitric acid were added, as well as four drops of thioacetamide solution, turning the solution light green and producing a gelatinous precipitate. The test tube was then boiled for approximately four minutes. This caused a black solid to precipitate out, indicating that copper was the cation present. To confirm this, aqueous potassium iodide was added. This produced a dark drown precipitate, confirming copper as the cation

The purpose of performing the variety of tests that we did was to give more accurate results of what the unknown mineral was. By roasting the copper mineral, we obtained copper(II) oxide. This new sample came out of the crucible grayish-black. It was very brittle and full of cracks. This provided the percent composition that was necessary in finding the unknown mineral. When performing

The main purpose in doing this experiment was to figure out how much of the percentage of Copper’s mass is in a brass alloy using a spectrophotometer that is hooked up to the laptop. Another purpose in doing this experiment is to learn how to use the Beer’s Law plots to learn how to use the equation and get the correct concentrations. This is important in everyday context because it is important for people who work doing many different types of jobs. Safety Information: In this lab, we used nitric acid to reactant with copper.

Copper is the 29th element in the periodic table, located more specifically at group 11, period 4. Because of its chemical and physical attributes, it is a transition metal, which denotes high boiling and melting points. Both a conductor of heat and electricity, Copper is ductile and malleable. Its symbol “Cu” derives from the Latin cuprum. Copper is also valued for its two-for-one practicality: it is a vital nutrient that has antibacterial properties. Aside from what many people generally know about Copper (the “common knowledge,” so to speak), there is much information regarding its atomic buildup.

The anode and cathode are then placed in copper (II) sulfate solution. Copper ions leave the anode and are attracted to the cathode where the copper atoms latch on. The cathode increases in size as more and more of the copper atoms leave the anode. What is left behind of the anode is the impure metal forming a sludge of different metals beneath it.

When copper hydroxide is heated (in reaction 3), water is released as copper hydroxide decomposes into a second insoluble compound, copper(II) oxide. Copper(II) oxide, a base, then undergoes an acid-base reaction in reaction 4 with the addition of aqueous sulfuric acid, H2SO4 . The water-soluble salt, copper(II) sulfate, CuSO4 forms.

For this experiment, an electric hot plate was used to heat up the substances CuSO4 *5H20, and CaSO4*XH2O to determine the amount of moles of H2O when given in grams; in addition to the amount of percent error. 2.012g of CuO*5H2O was started with, and then after a few minutes of heating it on the electric plate, once it had turned almost white, it was then removed and weighed and it demonstrated that the mass had gone down to 1.179g, meaning, .833g of H20 was lost. For the CuSO4*XH20, there was no exact time as to when the mass has stopped changing but 2.046g of CuSO4*XH20, was measured out and heated for 20 minutes. At the end of the 20 minutes, the mass had gone down to 1.607g, resulting with 0.439 of H2O lost during the heating process.

The correct theoretical empirical formula for the Hydrous Copper Sulfate solution is CuSO4 * 5H2O. From the data and results of calculation from this experiment, the empirical formula that was found during the process is CuSO4 * 5H2O. The sum of the percentage from the water, copper, and sulfate found in the solution added up to be 102%, a little over the normal 100%. From the least to greatest percentage of error, copper (Cu) with 2.291%, water (H2O) with 2.77%, and sulfate (SO4) with the greatest percentage of error of 3.691%. Overall, the percentage of error were made during this lab is acceptable. There could had been many type of error made during the process of this lab. One of the primary error that is most likely to be made while determining

“The Synthesis of alum crystals” Experimental 2 – The aim of the experiment is to prepare Alum (KAl(SO4)2.12H2O) from scrap aluminum. In order to speed up the reaction, the lacquer and paint of the scraped aluminum were cleaned and cut into smaller pieces and placed in a 250 ml beaker. After the addition of 50 ml of 1.4 M potassium hydroxide, the solution was heated for approximately 30 minutes. The color of the solution changes from light white to a dark grey solution. Once the solution is cooled down, it was filtered using a vacuum filtration.

During the lab the staring copper reacted with 10 drops of nitric acid, creating a dark green liquid. Distilled water was added to increase the volume and turned the liquid into an electric blue. Then 10 drops of sodium hydroxide

At the end of the experiment when the lid was removed, it was found out that the blue colour of the copper (II) sulphate solution has faded away. It was turned to pale grey and there were some precipitates present. It was the zinc powder that was in excess to ensure that the copper (II) sulphate solution could react fully with the zinc powder.

Discard the solution in the appropriate container as directed to you by your lab instructor.