Which is the Anode and Which is the Cathode in this Cell?

  • Thread starter Thread starter weirdobomb
  • Start date Start date
AI Thread Summary
In the discussion, the solubility product for CuI(s) is given as 1.1 x 10^-12, and the half-reaction for CuI is analyzed to determine cell potential. The standard cell potential is calculated using the Nernst equation, leading to a result of approximately 0.18675 Volts, which is close to the textbook answer of 0.19V. The user initially struggles to identify the anode and cathode but concludes that the half-reaction CuI + e- => Cu + I- represents the cathode, while Cu+ + e- => Cu is the anode. Clarification on whether the cell is electrolytic or galvanic is deemed unnecessary for solving the problem.
weirdobomb
Messages
15
Reaction score
0

Homework Statement


The solubility product for CuI(s) is 1.1 x 10^-12. Calculate
the value of cell potential for the half-reaction

CuI + e- => Cu + I-

I find the other half reaction is Cu+ + e- => Cu E=0.52V

Homework Equations


I use the Nernst equation to solve for the standard cell potential, then fill in E = E(cathode) - E(anode) to solve the remaining unknown.

The Attempt at a Solution


Heads up I found the solution to be 0.18675 Volts through trial and error, the solutions at the back of the textbook say 0.19V. I had a hard time reasoning which is the anode/cathode. How do I find this? Is it beacuse when solving for the standard cell potential in the Nernst equation that I get E = -0.707V?

Also, I'm not sure if this is an electrolytic cell or galvanic cell but does that matter when solving?
 
Physics news on Phys.org
I think I have solved my question, I was over thinking it. The half-reaction is given as it is and by looking at it's form, it is the cathode. Thus Cu+ + e- => Cu is the anode.
 
Thread 'Confusion regarding a chemical kinetics problem'
TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
I don't get how to argue it. i can prove: evolution is the ability to adapt, whether it's progression or regression from some point of view, so if evolution is not constant then animal generations couldn`t stay alive for a big amount of time because when climate is changing this generations die. but they dont. so evolution is constant. but its not an argument, right? how to fing arguments when i only prove it.. analytically, i guess it called that (this is indirectly related to biology, im...
Back
Top