Two graphite electrodes are connected to a 9V battery. The electrodes are placed

Question

Two graphite electrodes are connected to a 9V battery. The electrodes are placed into a single solution containing MgF2 and Lil, 4. a. Make a list of the five species present in the solution: b. Write the reaction occurring on the electrode connected to the(+) terminal of the battery. c. write the reaction occurring on the electrode connected to the terminal of the battery. d. Write the overall balanced chemical reaction that is occurring. e. What is the minimum voltage that is needed to have any reaction occur? If an ammeter connected to the system measures a current flow of 2.52 amps over a course of 20. minutes. What mass of material will be produced at the anode? f.

Explanation / Answer

a

MgF2 = Mg2+ + F-

LiI = Li+ + I-

note that

F- + H2O <--> HF + OH-

therefore at least:

Mg2+, F-, HF, Li+, I-

b.

in the positive species:

Mg2+ + 2 e Mg(s) 2.372; Li+ + e Li(s) 3.0401

must be Mg, since it will reduce to form Mg(s)

c

the negativ especies will be Lithium, since it is getting oxidized

therefore

Li(s) = Li+ + e-

d)

overall

Mg+2 + 2Li = 2Li(s) + Mg(s)

e)

min voltage:

e°cell = Ecathode -Eanode

E°cell = EMg - ELi =-2.372 --3.0401 = 0.6681V requried

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