Then 5mL of HCl was added to copper to completely remove all traces of zinc. Once the bubbling had stopped, the rest of the liquid was decanted away from the copper. Then the copper recovery set up was put together using tubing, Buchner funnel, filter paper and suction flask. Then the filter paper was weighed before placing it in the funnel and wetted down. The aspirator was turned to medium high, and then the copper was poured onto wetted filter paper.
2. Add 0.6g of zinc into the beaker. Mix the zinc with a stir rod. 3. Then, wait at least ten minutes for the zinc to settle.
Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds. Then, add the supernatant into the boiling test tube and repeat this step one more time with another 1 mL of deionized water. Acquire a pair of metal test tube holders and heat the boiling test tube to evaporate the water for 15 minutes. Let is cool after and weigh it. Then, calculate a percent yield of zinc iodide and write a balanced chemical equation and determine the limiting
Materials and Methods Part 1 For the cation elimination test first 10 drops of potassium, iron (III), zinc (II), copper (II), and cobalt (II) were added to 5 centrifuge tubes and the color was recorded. Then for the metal hydroxide test, 6 M NaOH was added drop wise till a precipitate was formed. Each solution except potassium formed a precipitate, so then 10 additional drops of NaOH were added to the remaining solutions. Tubes were cleaned with distilled water and 6 M HCL. Next was the ammonia test 10 drops of each metal solution were added to new centrifuge tubes and 15 M NH4OH was added until the solution changed color or a precipitate was formed.
Re-formation of Copper Metal through Chemical Reactions of the Copper Cycle Evon Looper Introduction Copper is a necessary metal in human development, however in high concentrations it can become a toxin for both human and ecosystem health. Because of its abundance on Earth, it is important for scientists to examine the properties and characteristics of copper. One of these characteristics is the ability to re-form copper metal after going through a series of different chemical reactions that make up the Copper Cycle. Materials and Methods The experiment began by measuring 0.2455 g of copper turnings using an analytical balance, which was transferred to a 50 mL beaker. The beaker was then moved to a stir plate with a stir bar and held in place by a ring stand.
A cuvette block, four cuvettes, three 50 mL beakers, one 150 mL beaker, and one 5mL pipet were obtained. The phosphate buffers NaH₂PO₄ and Na₂HPO₄ were procured weighing .4060g and .4106g respectively. The phosphate buffers were then transported to the 150mL beaker. Next 50mL of distilled water was measured using a graduated cylinder and added to the 150mL beaker. Twenty drops of bromothymol blue was also added to the 150mL beaker.
I capped the tube and I mixed until the tablet disintegrates. I wait 5 minutes for the color to develop. Then I compared the blue color of the solution to the potassium color chart: L = 40 lbA/6" soil, M = 80 lb A/6" soil, and H = 160 lb A/6" soil. For the nitrogen I used the pipet to transfer 25 drops of the clear solution above the soil to a square test tube. Then, I filled the tube to the shoulder with distilled water.
Experiment 2 Time | Observations | 5 minutes | Bubbled like sugar | Once salt water was added | Turned soapy white and thick | Equation: METHOD 1) Put 2 cm3 of castor oil into a 250 cm3 beaker and add 10 cm3 of 5mol.dm-3 sodium hydroxide from a measuring cylinder. (Take care when measuring this out and adding it to the beaker to avoid any drips and spills.) 2) Heat the mixture gently over a tripod and gauze, STIRRING CONSTANTLY with a glass rod (otherwise the mixture erupts). Allow to simmer (boil gently) for 5 minutes. Steady the beaker using
Then, 3.4 g of ammonium sulfate was slowly added to the supernatant 1 as it was stirred for 15 min to achieve 50% saturation (85g/L of solution). The supernatant was then centrifuged at 9000 x g and 40C for 15 min and 5 ml of the second supernatant was transferred to a conical tube. The obtained second pellet was resuspended in 4 ml of distilled water and transferred into another dialysis
Measure 0.10 g of copper powder within 0.098 to .102 g 2. Put the copper into a 140 mL beaker and move the beaker to the fume hood. 3. Slowly add 2mL of concentrated nitric acid (8M) to the copper and swirl the beaker so all the copper can react with the nitric acid. 4.