## dilutions and Ecell

$\Delta G^{\circ} = -nFE_{cell}^{\circ}$

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

### dilutions and Ecell

How does diluting a solution effect the Ecell value? This was a question on test 2.

Anika Chakrabarti 1A
Posts: 102
Joined: Sat Aug 24, 2019 12:17 am

### Re: dilutions and Ecell

If it is a concentration cell, diluting the side with a lower concentration would increase the concentration difference between the anode and the cathode, causing the cell potential to increase.

Shivam Rana 1D
Posts: 106
Joined: Fri Aug 09, 2019 12:16 am

### Re: dilutions and Ecell

It depends on where the dilution takes place but diluting the cathode solution should decrease the cell potential.

Samuel Tzeng 1B
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

### Re: dilutions and Ecell

If it's a cathode solution (like on test 2) then diluting it will decrease cell potential

Pegah Nasseri 1K
Posts: 100
Joined: Wed Feb 27, 2019 12:15 am

### Re: dilutions and Ecell

Remember that E˚(cell) = E˚(cathode) - E˚(anode). The greater the concentration difference between the cathode and anode, the greater your standard cell potential. If you dilute the cathode, you will decrease the cell potential because you are lowering the concentration of the cathode, lowering the concentration difference between the cathode and anode. Meanwhile, if you dilute the anode, you are making the anode concentration smaller which increases the concentration difference between the cathode and the anode, making the cell potential increase.

SimranSangha4I
Posts: 99
Joined: Sat Sep 14, 2019 12:17 am

### Re: dilutions and Ecell

Well it really depends on where it is actually taking place but if it's in the side with a lower concentration would increase the concentration. In a cathode solution, it would decrease the cell potential.

ValerieChavarin 4F
Posts: 99
Joined: Wed Sep 18, 2019 12:18 am

### Re: dilutions and Ecell

It is important to note where the dilution is occurring as it will affect cell potential differently if it is in the cathode or anode. You can use E˚(cell) = E˚(cathode) - E˚(anode) to get a better understanding. When the cathode is diluted, cell potential decreases due to the lower cathode. Therefore, when the dilution occurs in the anode, the cell potential increases.

Charlene Datu 2E
Posts: 62
Joined: Wed Sep 11, 2019 12:16 am

### Re: dilutions and Ecell

Does this apply to both galvanic and concentration cells? Do the differences between these two types of cells affect the way a dilution affects the Ecell?

ramiro_romero
Posts: 90
Joined: Sat Sep 07, 2019 12:16 am

### Re: dilutions and Ecell

Diluting the cathode solution decreases the value of the cell potential, while diluting the anode solution increases the value of the cell potential. This is because of the differences between the anode and cathode when finding Ecell=Ecathode-Eanode.