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Question

soft Word tivation Failed) Mailings Review View AaBbCcI AaBbCcl AaBb AaBb( AaBb B' ||TT Normal ITNO Spaci Heading 1 Title Sube A- ::-. Paragraph Styles Determine the mass of the object to be coated and copper anode to nearest 001 grams, Add 200mL of copper plating solution to a 250mL beaker. Hang the copper anode and objected to be coated as shown in the figure 1 by proper support. Hook up the power supply. The object to be plated should be wired directly to the negative (black) terminal. The copper strip (anode) should be wired to the positive (red) terminal through the ammeter., Before starting obtain your instructor's signature/approval. Turn on the power supply and begin timing. Adjust the current to 0.25Amperes. Monitor the current to maintain a constant reading. After 30 minutes tum off the power supply and timer, Remove the object and copper anode, rinse it with distilled water and allow to dry. Determine their mass to neamess 0.01 gram. Wash you hands before leaving the laboratory Name Lab Partner Section Start Date Finish Date Instructor's Initials V3 RECORD FORM OF DATA AND RESULTS: Mass of the copper anode strip before coating (Mlagram(g) Mass of the object to be coated before coating (M2)

Explanation / Answer

Mass of copper to be deposited

Q = I x t

    = 0.25 amp x 30 min x 60 s

    = 450 Coulombs

moles of electron passed = 450 C/96500 C

                                         = 0.0047 mol e-

1 mole of Cu require 2 mole of electron

moles of Cu deposited = 2 x 0.0047 mol e-

                                     = 0.0094 mol

mass of Cu deposited = 0.0094 mol x 63.55 g/mol

                                    = 0.60 g

1. A reduction in the mass of anode shows the chemical reaction has occured.

2. The plating cell is the cathode where deposition occurs.

3. (a) Coulombs transferred = 0.25 amp x 120 s = 30 C

(b) Faraday transferred = 30 C/96500 = 0.0003 F

4. mass of copper deposited = 0.60 g

moles of copper deposited = 0.60 g/63.55 g/mol = 0.0094 mol

5. Source of sopper deposited on the object is anode which undergoes oxidation.

6. Power supply is needed to carry out the chemical reaction in the cell.

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