Tuesday, March 19, 2019
lab :: essays research papers
introIn Lab 5 five we will be exploring the musical rhythm of papal bull with many chemic reactions. What we are going to do is take a piece of copper metal put it through a series of reactions that change its state of matter and chemical formula, but in the end, we will return it to its normal fast state. The idea of this lab is to try to recover as close to coulomb% of the copper we started with. Theoretically, this is come-at-able, but for inexperienced college students, retrieving vitamin C% of the copper metal is earnest impossible. There are five reactions that the copper will go through. 1.3Cu(s) + 8HNO3(aq) + O2 3Cu(NO3)2(aq) + 4H2O(aq) + 2NO2(aq)2.3Cu(NO3)2(aq) + 2NaOH(aq) Cu(OH)2(s) + 2NaNO3(aq)3.Cu(OH)2(s) CuO(s) + H2O(aq)4.CuO(s) + H2SO4(aq) CuSO4(aq) +H2O(aq)5.CuSO4(aq) + Zn(s) ZnSO4 + Cu(s)At the end of reaction number five we should have close to 100% of the copper we started out with.MethObtain as close to .5g of copper wire, and enroll the mass to t he closest mg. Make surely the wire is hang so it will lay as flat as possible in the bottom of a 250mL beaker. Then go to the hood and channel 4mL of 16M HNO3. Swirl the HNO3 around in the beaker with the copper until it has completely dissolved and you are left with a green/blue silver. Then add 30mL of 3M NaOH and awaken the stem on a ring stand with a bunsen burner. The blue/green jelly will turn in to dissever of a black dirt at the bottom of the beaker, make sure to stop boiling when the jelly turns black. teem all redundant liquid in the beaker. Do not remove any black precipitate. affix approximately 200mL of hot deionized water to the black precipitate. Decant all excess liquid again. Add 15mL of 6M H2SO4 and then under the hood add 2g of zinc metal to the solution. Once the Hydrogen has stopped bubbling add 10mL of HCl. Decant all excess liquid and transfer Copper metal to a glass dish and wash with deionized water. Rewash Copper metal with 5mL of Methanol. Dec ant and prohibitionist Copper metal on a hot plate, weigh and record results to nearest mg.ResuOriginal Mass of Cu=.486gMass of Cycled Cu=.480g1.In the first reaction the was brown smoke and the copper turned into a light blue/green liquid. 2.In the second reaction the solution turned into a clear blue liquid.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment