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.
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