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Problem 2 An aqueous solution is prepared by dissolving 100 mg/L of CaCl2 and 230 mg/L of Na, So, in water. Assuming that these salts dissociate completely, and that the dissociated ions do not undergo any additional reactions, calculate (a) the molar concentration of each ionic species; (b) the ionic strength of the solution; (c) the activity coefficient for each species (using the Davies equation); (d) the activity of each species Problem 3 The following data was obtained from the reaction of AB. Determine the order of the reaction for A and the value of the reaction rate constant k. Time A [mg L-') 0 90 10 72 20 57 36 8 8 8 98 23