Which is not a weak acid? choose one answer.

a. hcl

b. hf

c. hno2

d. h3po4?

Hello!

From this list, a) HCl is not a weak acid.

Hydrochloric Acid, or HCl, is one of the most common examples of a strong acid. Strong acids dissociate completely in water to generate H⁺ and A⁻ ions. For HCl this reaction is as follows:

HCl → H⁺ + Cl⁻

Being more precise, for an acid to be called strong it needs to be stronger than hydronium ion (H₃O⁺) pKa < - 1.74.

Have a nice day!