We all know how dangerous Pb contaminated water is. Many oxides can form while Pb is in contact with water, however, consider only PbO as the oxide in question (it may not protect the Pb from corroding). In this context, look up the Pb -water Pourbaix and assume activity for Pb ions is =10^-6 . (i) For the reaction between Pb and hydroxyl ions what is the equilibrium constant? (ii) Calculate the value of pH to the first decimal place? (iii) Can you locate this value on the Pourbaix diagram? Then, comment on the coordinates in a couple of sentences.