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Hydrogen halide
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<p>In <a href="/facts/Chemistry/SrNqkGVm">chemistry</a>, hydrogen halides (hydrohalic acids when in the <a href="/facts/Aqueous/eRNr3MH2">aqueous</a> phase) are <a href="/facts/Diatomic_molecule/hkfKAC7m">diatomic</a>, <a href="/facts/Inorganic_compound/TfFfzxSz">inorganic compounds</a> that function as <a href="/facts/Acid/FySU18n1">Arrhenius acids</a>. The formula is <a href="/facts/Hydrogen/BoYHjl0J">H</a>X where X is one of the <a href="/facts/Halogen/YeFgWHeA">halogens</a>: <a href="/facts/Fluorine/YUV0Fb8m">fluorine</a>, <a href="/facts/Chlorine/y27UwYBM">chlorine</a>, <a href="/facts/Bromine/oLfj3C7D">bromine</a>, <a href="/facts/Iodine/JlfMecMf">iodine</a>, <a href="/facts/Astatine/AlbHPBK5">astatine</a>, or <a href="/facts/Tennessine/eGCBDvEr">tennessine</a>. All known hydrogen halides are gases at <a href="/facts/Standard_temperature_and_pressure/JhJv9KFJ">standard temperature and pressure</a>. </p> <table><tbody><tr><th>Compound</th><th><a href="/facts/Chemical_formula/hghUtthl">Chemical formula</a></th><th>Bond length <i>d</i>(H−X) / pm(gas phase)</th><th>model</th><th>Dipole <a href="/facts/Dipole/G1vRqruD"><i>μ</i></a> / <a href="/facts/Debye/8BCTT383">D</a></th><th>Aqueous phase (acid)</th><th>Aqueous Phase p<i>K</i>a values</th></tr><tr><td><a href="/facts/Hydrogen_fluoride/XfQxlqR6">hydrogen fluoride</a>(fluorane)</td><td>HF</td><td></td><td></td><td>1.86</td><td><a href="/facts/Hydrofluoric_acid/wdXqu4bE">hydrofluoric acid</a></td><td>3.1</td></tr><tr><td><a href="/facts/Hydrogen_chloride/7Wzkhomd">hydrogen chloride</a>(chlorane)</td><td>HCl</td><td></td><td></td><td>1.11</td><td><a href="/facts/Hydrochloric_acid/HqItJlUT">hydrochloric acid</a></td><td>−3.9</td></tr><tr><td><a href="/facts/Hydrogen_bromide/rUw1duLA">hydrogen bromide</a>(bromane)</td><td>HBr</td><td></td><td></td><td>0.788</td><td><a href="/facts/Hydrobromic_acid/T6INXDR6">hydrobromic acid</a></td><td>−5.8</td></tr><tr><td><a href="/facts/Hydrogen_iodide/tlfNemUK">hydrogen iodide</a>(iodane)</td><td>HI</td><td></td><td></td><td>0.382</td><td><a href="/facts/Hydroiodic_acid/B5KQNSGA">hydroiodic acid</a></td><td>−10.4 </td></tr><tr><td><a href="/facts/Hydrogen_astatide/ySrczP9g">hydrogen astatide</a>astatine hydride(astatane)</td><td>HAt</td><td></td><td></td><td>−0.06</td><td><a href="/facts/Hydroastatic_acid/ySrczP9g">hydroastatic acid</a></td><td>?</td></tr><tr><td><a href="/facts/Tennessine/eGCBDvEr">hydrogen tennesside</a>tennessine hydride(tennessane)</td><td>HTs</td><td></td><td></td><td>−0.24 ?</td><td>hydrotennessic acid</td><td>?</td></tr></tbody></table>