The only difference is we have different concentrations of solutions because we learned from this equation that even though this guy might be zero, the concentration difference will still create an electric potential or cell voltage. Now, what is this guy for, this type of electrochemical cell called the concentration cell? Well, let's see. Well, our E of the cell or cell voltage of our cell is equal. To notice this guy is now zero, because if we try to find our E on the standard conditions what we will get is that this guy and this guy are actually the same. The value on our table is the same.