What is the concentration when 0.030 moles of formic acid are dissolved with 0.0020 moles of MgCl2 to a total volume of 1.00 liter? The Ka of formic acid is 1.80x10-4. You can assume that the MgCl2 dissociates completely and does not participate in any further reactions. Answer with 2 significant figures, which means that you must use activity coefficients. Iterate activity coefficients until converging to a stable value of [formic acid] eq (i.e. the second sig fig remains unchanged). do not use the table or the extended Debye-Huckel equation to arrive at activity coefficients.