[MrHappy0]

A voltage of 0.568 v is measured for the following cell:

Pb(s)/PbF2(s)/F^-(0.1M)//Cl^-(0.1M)/AgCl(s)/Ag(s)
Determine Ksp for PbF₂

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PbF2+2e-->Pb +2F^-   E= -0.350

2AgCl +2e ---> 2Ag+ 2Cl^-        E= 0.222

K=10^{-2(0.568+0.350/0.0592)}


Does this look correct?

[Borek]

No idea what you did, please explain it step by step.

[MrHappy0]

I think what I did was find the Ksp of the overall reaction not the PbF₂ reaction. I think even the Ksp for the overall reaction is wrong. Not really sure how I would get to the Ksp of PbF₂.

[Borek]

Use information provided to calculate concentration of Pb²⁺.

[Pradeep]

I think you have use the E⁰ value of Ag/AgCl cell. You know the Cl- concentration. So, you can find the Ag/AgCl half cell voltage by nernst's equation .

After, Find the voltage of the Pb/PbF2 half cell.

There after you may substitute those data on nernst's equation. And you can find the Pb2+ concentration. After that you can work out Ksp value.

[MrHappy0]

I think you have use the E⁰ value of Ag/AgCl cell. You know the Cl- concentration. So, you can find the Ag/AgCl half cell voltage by nernst's equation .

After, Find the voltage of the Pb/PbF2 half cell.

There after you may substitute those data on nernst's equation. And you can find the Pb2+ concentration. After that you can work out Ksp value.

Ah, okay. Thanks!! So it isn't a very challenging problem it just has some tedious work. I don't have the time to go back to it right now but I will try this as soon as I can.

[Pradeep]

If Pb/PbF₂ half cell voltage is not available for you, then you have to calculate it by using standard half cell potential of Pb/Pb²⁺ and K_sp of PbF₂. By substituting them in Nernst's equation.

[Borek]

If Pb/PbF₂ half cell voltage is not available for you, then you have to calculate it by using standard half cell potential of Pb/Pb²⁺ and K_sp of PbF₂. By substituting them in Nernst's equation.

So you are suggesting to calculate potential using Ksp, then to use potential to calculate Ksp. I have a felling you are moving in circles.

[Pradeep]

Yes. Borek is corect. You have to find the PbF₂/Pb potential.