Which Equation Best Describes a 0 $\approx$ [OH^-]
C) [H₃O⁺] $\approx$ Final Concentration of HI
D) [H₃O⁺]

Which equation best describes a 0.10 M solution of a strong acid such as hydroiodic acid (HI: K_a = 3 x 10⁹) ?

A) [H₃O⁺] = initial concentration of HI
B) [H₃O⁺] $\approx$ [OH^-]
C) [H₃O⁺] $\approx$ final concentration of HI
D) [H₃O⁺] $\approx$ [H₂O]
E) [H₃O⁺] $\approx$ K_a.[OH^-]