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Wednesday, February 6, 2019

lab :: essays research papers

IntroIn Lab 5 five we get out be exploring the cycle of crap through m each chemical reactions. What we atomic number 18 going to do is take a piece of copper met solelyic element put it through a series of reactions that change its enjoin of matter and chemical formula, but in the end, we volition re twirl it to its normal solid state. The idea of this lab is to try to recover as close to 100% of the copper we started with. Theoretically, this is possible, but for inexperienced college students, retrieving 100% of the copper admixture is near 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 earn close to 100% of the copper we started out with.MethObtain as close to .5g of copper wire, and record the mass to the closest mg. Make sealed the wire is bent so it will lay as apartment as possible in the bottomland of a 250mL beaker. then(prenominal) go to the stumblebum and add 4mL of 16M HNO3. Swirl the HNO3 around in the beaker with the copper until it has altogether dissolved and you are left with a green/blue liquid. Then add 30mL of 3M NaOH and heat the solution on a ring root word with a Bunsen burner. The blue/green jelly will turn in to sort of a black dirt at the bottom of the beaker, make sure to stop boiling when the jelly turns black. pullulate all excess liquid in the beaker. Do not remove any black precipitate. Add approximately 200mL of blistering 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 foaming add 10mL of HCl. Decant all excess liquid and transfer blur metal to a glass dish and wash with deionized water. Rewas h Copper metal with 5mL of Methanol. Decant and dry Copper metal on a hot plate, weigh and record results to nearest mg.ResuOriginal big bucks 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 spot reaction the solution turned into a clear blue liquid.

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