A Solution Contains 3

Multiple Choice

A solution contains 3.8 × 10^-2 M in Al³⁺ and 0.29 M in NaF.If the K_f for AlF₆^3- is 7 × 10¹⁹,how much aluminum ion remains at equilibrium?

A) 1.1 × 10^-19 M
B) 3.1 × 10^-22 M
C) 9.1 × 10^-19 M
D) 1.9 × 10^-21 M
E) 4.4 × 10^-20 M