Question

Determine the [OH⁻] of a solution that is 0.140 M in F⁻.

Answer 1

To determine the [OH⁻] of a solution that is 0.140 M in F⁻, we can use the relationship between hydroxide ion concentration and the concentration of the fluoride ion.

Step-by-step explanation:

To determine the [OH⁻] of a solution that is 0.140 M in F⁻, we can use the relationship between hydroxide ion concentration ([OH⁻]) and the concentration of the fluoride ion ([F⁻]).

Since F⁻ is the conjugate base of the weak acid HF, we can assume that the hydrolysis reaction occurs and produces H⁺ ions and OH⁻ ions:

HF(aq) + H₂O(l) ⇌ H₃O⁺(aq) + F⁻(aq)

Since F⁻ is a spectator ion, the concentration of OH⁻ will be equal to the concentration of H₃O⁺:

[OH⁻] = 0.140 M