Normally the temperature is 25 degrees Celsius or 298 degrees Kelvin. But it could really be anything. So, in a previous lecture we saw that the relationship between equilibrium constant K on the standard conditions is the following log of base ten of k is equal to number of moles of electrons and times our cell voltage on the same state conditions divided by 0.0592. Now, this guy is at equilibrium is when our reaction is at equilibrium. And if our reaction has reactants A and b and C and D which are all in an Aqueous state, then our equilibrium constant expression is the following if k equals the ratio of the concentration of products divided by the ratio of the concentration of reactants. Now, to begin our process of adjusting for the new relationship between the concentration and the cell potential, let's look at gives free energy.