1) The dissolved ionic species in natural waters are often more complex than we have discussed in class. For example, a

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1 The Dissolved Ionic Species In Natural Waters Are Often More Complex Than We Have Discussed In Class For Example A 1 (65.69 KiB) Viewed 100 times

1) The dissolved ionic species in natural waters are often more complex than we have discussed in class. For example, a solution may be saturated with respect to both gypsum and barite given by the following reactions, with the sulfate ion in common: CaSO4.2H20 = Ca2+ + (SO4)2 + 2H2O BaSO4 = Ba2+ (SO4)21 The solubility constants for gypsum and barite (respectively) are provided in Faure Table 10.1 as follows: [Ca2+][S0?) = 1046 [Ba2+1 80.21 = 100.0 Use the above equations and the Law of Mass Action to calculate the ratio of Ca2+ to Ba2+ activities in a solution saturated with respect to both gypsum and barite. How many times greater is the activity of the Ca2+ ion compared to that of Ba2+? Which will precipitate first out of a solution saturated with both? What does this mean for precipitation of sulfate minerals in the ocean? (20 points)