2. The solution chemistry from a volcanic ash soil sampled in Lassen National Park in Northern California. All units are mol/L and ignore activity corrections (assume =1 for all ions) ( 18pts ): pH=7,Fe3+(aq)=1010,Fe2+(aq)=105,Na(aq)=103,Cl(aq)=103,CO32(aq)=107 a) Calculate the saturation index () for ferrihydrite, goethite, siderite, and magnetite. Assume that the following dissolution reactions to and data given to calculate your answers (10 pts). Ferrihydrite:Goethite:Siderite:Magnetite:Fe(OH)3(s)+3H+(aq)Fe3+(aq)+3H2O(l)FeOOH(s)+3H+(aq)Fe3+(aq)+2H2O(l)Fe(II)CO3(s)Fe2+(aq)+CO32(aq)Fe(III)2Fe(II)O4(s)+8H+(aq)2Fe3+(aq)+Fe2(aq)+4H2O(l) b) What will be the sequence of precipitation/dissolution evens in the system (4 pts)? c) Which mineral is predicted to be the most stable and persist in high weathering environments (4 pts)