Slowly transfer the contents of the beakeronto the filter paper a The water

Slowly transfer the contents of the beakeronto the

This preview shows page 26 - 28 out of 66 pages.

4)Slowly, transfer the contents of the beakeronto the filter paper. a.The water should pass through the filter paper leaving behind the copper.b.Do not allow the liquid volume to exceed the height of the filter paper.c.To prevent loss of product, it may be advisable to transfer the solution carefully down the length of a glass stir rod and onto the filter paper.d.Ensure all of the copper is collected by rinsing beaker well and transferring onto filter paper. 5) Measure out approximately 50.0 mL of deionized water and place into a 100 –250 mL beaker. 6) Measure out 5.0 mL of 6.0 M sulfuric acid with a graduated cylinder and then add to the beaker of deionized water to create an acid rinse. a. This step is necessary to ensure all zinc has been eliminated. b. Make sure you add the acid TO the deionized water and not the reverse. 7) Add this acid rinse to your collected copper and allow liquid to filter through. 8)Following the addition of the acid rinse, wash thoroughly with copious amounts of deionized water. 9) After the filter paper has drained from the last rinse, transfer filter paper with contents onto the pre–weighed watch glass. 10) Place sample into a warm oven to dry. a. Allow at least 20–30 minutes to ensure dryness. 11) Once dry, carefully remove from the oven and allow to cool to room temperature. 12) Once cool, obtain the mass of the sample and record on data table. Experiment #5 Barnett Waste Disposal and Clean–Up : 1) Place all acidic filtrates into labeled waste beakers under the hood for neutralization. 2) All copper and unreacted zinc should be placed in the appropriate waste containers.
Image of page 26
27 The Lab Write – Up : 1) Provide the IUPAC name, molar mass, and percent copper for all five unknown copper salts. 2) Provide a balanced equation for all possible reactions. 3) Calculate the experimental mass percent copper in your unknown copper salt and correctly identify which copper salt you were given. In your conclusion, compare the experimental mass percent copper determined with all possible copper salts. 4) In addition, explain all relevant data collected in conclusion and discuss reasons for error. Experiment #5 Barnett 5 ) Reflecting back onto previous labs, what would be another way to identify the unknown copper salt? Briefly provide a step–by–step procedure for this alternate method. Data Table for Percent Copper in Reactants : glyph1197o. Formula of Copper Salt IUPAC glyph1197ame Molar Mass (g/mol) Mass Percent Copper (%) 1 Cu 3 (PO 4 ) 2 • 3H 2 O 2 CuCl 2 • 2H 2 O 3 CuSO 4 • 5H 2 O 4 Cu(ClO 4 ) 2 • 6H 2 O 5 CuSeO 4 • 5H 2 O 6 Cu(CH 3 CO 2 ) 2 • H 2 O Data Table : a) Unknown number/letter of copper salt: ________ b) Mass of unknown copper salt in grams: ________ c) Mass of mossy zinc in grams:________ d) Mass of watch glass + filter paper in grams: ________ e) Mass of watch glass + filter paper + copper in grams: ________ f) Mass of copper in grams: ________ g) Experimental mass percent copper in salt: __________ h) Identity of copper salt based on mass percent copper: ________ i) Balanced equation for the reaction: _____________________________ j) Balanced equation for zinc elimination:__________________________
Image of page 27
Image of page 28

You've reached the end of your free preview.

Want to read all 66 pages?

  • Spring '19
  • Chemistry, Chemical reaction, Timothy Barnett

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes