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A solution contains 3.8 x 10^-2 M in Al^(3+) and 0.29 M in NaF. If the Kf for AlF6^(3-) is 7 x 10^19, how much aluminum ion remains at equilibrium? A. 1.1 x 10^-19 M B. 3.1 x 10^-22 M C. 9.1 x 10^-19 M D. 1.9 x 10^-21 M E. 4.4 x 10^-20 M