Question

What is the equation for the acid dissociation constant, K₂, of HF?HF(aq) + H₂O(1) H₂O*(aq) + F'(aq)O A. K. =O B. K₂ =() c. K. =[HF][H,O [F][HF] [H₂O][H₂O+ ][F][H₂O+][F][HF]

Answer 1

Option C.

Step-by-step explanation

The given dissociation of HF is shown below:

HF(aq) + H₂O(l) ⇌ H₃O⁺(aq) + F⁻(aq)

Hence, the equation for the acid dissociation constant Kₐ, of HF will be:

`K_a=([H_3O^+][F^-])/([HF])`

The reason that water (H₂O) does not appear in Ka is that the activity of water is assumed to be very nearly equal to 1.

Hence, the correct answer is option C.