A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr^3+ and a gold

Question

A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr^3+ and a gold electrode in a solution that is 1.0 M in Au^3+.

a) Provide the half cell reactions for each of the electrodes.
b) Which is the anode and which is the cathode? How did you know?
c) Give an overall balanced equation.
d) Calculate the E cell at 25 degrees Celsius. A voltaic cell made of a Cr electrode in a solution of 1.0 M in Cr^3+ and a gold electrode in a solution that is 1.0 M in Au^3+.

a) Provide the half cell reactions for each of the electrodes.
b) Which is the anode and which is the cathode? How did you know?
c) Give an overall balanced equation.
d) Calculate the E cell at 25 degrees Celsius.

Explanation / Answer

1)

oxidation half cell reaction is     Cr + ------------------>   Cr^+3

reduction half cell reaction is     Au^+3------------------>   Au

2)Cr electrode act as anode,,gold electrodeact as cathode

3) Cr + Au^+3--------------------->   Cr^+3 + Au

4)e cell= 1.40-(-0.74) =2.14v

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