A Solution Is Prepared by Adding 4

Multiple Choice

A solution is prepared by adding 4.50 mol of sodium hydroxide to 1.00 L of 1.00 M Co(NO₃) ₂. What is the equilibrium concentration of cobalt ions? K_f = 5.0 × 10⁹ for Co(OH) ₄²⁻

A) 1.1 × 10 ⁻² M
B) 1.4 × 10 ⁻⁵ M
C) 3.2 × 10 ⁻⁹ M
D) 2.0 × 10 ⁻¹⁰ M
E) 4.9 × 10 ⁻¹³ M