Question

Anhydrous hydrogen fluoride, HF, has a liquid range from 190 to 292.5 K and, similar to...

Anhydrous hydrogen fluoride, HF, has a liquid range from 190 to 292.5 K and, similar to water, it autoionizes with an autoionization constant of ≈ 2 ×10–12.

(a) (3 pts) Write the balanced chemical equilibrium that describes the autoionization of HF(l) using the Brønsted-Lowry perspective. On each side of the chemical equilibrium, identify the (conjugate) acid and the (conjugate) bases.

(b) (1 pt) Write the mass-action expression for the autoionization of HF(l).

(c) (3 pts) Given the autoionization constant, identify the concentration conditions that would make acidic, neutral, and basic solutions of HF(l).

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Answer #1

(a) Autoionization of HF:

HF    + H2O      F-    +         H3O+

Acid            Base           Conjugate acid     Conjugate base

(b) Mass action expression:

Kc = [F-][H3O+] / [HF]

(c) Autoionization constant:

K = [F-][H3O+]

Acidic : [F-] < [H3O+]

Basic : [F-] > [H3O+]

Neutral : [F-] = [H3O+]

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