you make a galvanic cell by adding 50.0mL of 0.500 M Ni(NO3)2 along with Ni9s) electorde to one side of the cell and the standard hydrogen electorde to the other side of the cell. If the temperature of this cell is 10.25 degree C , what is the electrochemical potential of this cell? E Ni2+/Ni= -0.230V