Thursday, May 30, 2019
lab :: essays research papers
IntroIn Lab 5 five we will be exploring the cycle of pig bed through many chemical reactions. What we argon going to do is take a piece of atomic number 29 surface put it through a serial publication of reactions that change its state of matter and chemical formula, but in the end, we will return it to its normal solid state. The idea of this lab is to screen 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 metal 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 have 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 sure the wire is bent so it will lay as flat as possible in the bottom of a 250mL beaker. Then go to the hood and add 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/ profane liquid. Then add 30mL of 3M NaOH and heat the firmness of purpose on a ring stand 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 change state when the jelly turns black. Decant all excess liquid in the beaker. Do not remove any black precipitate. Add approximately 200mL of hot deionized piss 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 halt 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. Decant a nd dry 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
Note: Only a member of this blog may post a comment.