Trains hf hcl hbr energy according to their acidic nature
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The strength of the acid INCREASES with the DECREASE of overlap between the halogen atom and the hydrogen atom. Hydrogen fluoride is thus the weakest acid, and hydrogen iodide is the STRONGEST acid. Note also that an entropy component operates in this reaction, and the fluoride anion is definitely the LEAST favourable anion entropically…For HCl, HBr, and HI, ionization would be quantitative in aqueous solution. In a more acidic solvent, say acetic acid, acidity could be differentiated…and certainly hydrogen iodide is the strongest acid…
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