Hello, I have a problem with this task: "Water with pH 5 and reduction potential +0.30 V flows through copper pipe at 25 °C. Calculate how much copper dissolves (in ppm) in water due to corrosion of this pipe. Standard reduction potential of copper Cu0/Cu2+ is 0.34 V." I spent lot of hours with lot of calculations without any glory :( Please, is there anybody who could try to help me? This figure could be helpful: http://www.advancedaquarist.com/2003/5/chemistry_album/figure3.gif I tried to use Nernst equation: Eh = E0 - (RT / nF)*(lnQ). The main equation I used was: Cu + 2H+ -> Cu2+ + H2.