10.8: Ionization Constants of Weak Acids

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Acid	Formula	<emK_a at 25 °C
acetic	CH₃CO₂H	$1.8\times{10}^{-5}$
arsenic	H₃AsO₄	$5.5\times{10}^{-3}$
	H₂AsO₄⁻	$1.7\times{10}^{-7}$
	HAsO₄²⁻	$5.1\times{10}^{-12}$
arsenous	H₃AsO₃	$5.1\times{10}^{-10}$
boric	H₃BO₃	$5.4\times{10}^{-10}$
carbonic	H₂CO₃	$4.3\times{10}^{-7}$
carbonic	HCO₃⁻	$5.6\times{10}^{-11}$
cyanic	HCNO	$2\times{10}^{-4}$
formic	HCO₂H	$1.8\times{10}^{-4}$
hydrazoic	HN₃	$2.5\times{10}^{-5}$
hydrocyanic	HCN	$4.9\times{10}^{-10}$
hydrofluoric	HF	$3.5\times{10}^{-4}$
hydrogen peroxide	H₂O₂	$2.4\times{10}^{-12}$
hydrogen selenide	H₂Se	$1.29\times{10}^{-4}$
hydrogen selenide	HSe^–	$1\times{10}^{-12}$
hydrogen sulfate ion	HSO₄⁻	$1.2\times{10}^{-2}$
hydrogen sulfide	H₂S	$8.9\times{10}^{-8}$
hydrogen sulfide	HS^–	$1.0\times{10}^{-19}$
hydrogen telluride	H₂Te	$2.3\times{10}^{-3}$
hydrogen telluride	HTe^–	$1.6\times{10}^{-11}$
hypobromous	HBrO	$2.8\times{10}^{-9}$
hypochlorous	HClO	$2.9\times{10}^{-8}$
nitrous	HNO₂	$4.6\times{10}^{-4}$
oxyalic	H₂C₂O₄	$6.0\times{10}^{-2}$
oxyalic	HC₂O₄⁻	$6.1\times{10}^{-5}$
phosphoric	H₃PO₄	$7.5\times{10}^{-3}$
	H₂PO₄⁻	$6.2\times{10}^{-8}$
	HPO₄²⁻	$4.2\times{10}^{-13}$
phosphorous	H₃PO₃	$5\times{10}^{-2}$
phosphorous	H₂PO₃⁻	$2.0\times{10}^{-7}$
sulfurous	H₂SO₃	$1.6\times{10}^{-2}$
sulfurous	HSO₃⁻	$6.4\times{10}^{-8}$