Why HF is the weakest acid and HI is the strongest ?

Explanation

`K_(a) (HF) = 7 × 10^(−4) K_(a) (HI) = 7 × 10^(11)`
Intermolecular H-bonds in H – F and high bond dissociation enthalpy of H – F makes it weakest and weak bond in H – I makes it strongest.