What does the host mean when he says that the acid has "donated a proton" to the water? A.

When hydrochloric acid is dissolved in water, a proton disappears in the chemical reaction.

B.

When hydrochloric acid dissociates, a positive hydrogen atom is accepted by water to form H₃O+.

C.

When hydrochloric acid dissociates, a negative hydrogen atom is accepted by water to form H₃O-.

Option B

Explanation:

As Brønsted-Lowry theory states, acids are the ones that can donate protons.

When a proton is donated, it is released to become medium more acidic.

HCl is a strong acid.

HCl (l) + H₂O (l)  →  H₃O⁺ (aq) +  Cl⁻(aq)

These always reffers to strong acid where the dissociation is 100% completed.

In a weak acid, dissociation is not 100% complete, that's why we have an equilibrium.

HA (l) + H₂O (l)  ⇄  H₃O⁺ (aq) +  A⁻(aq)                   Ka

i'm pretty sure its b i might be wrong though!