Ionization Constants of Weak Acids

Ionization Constants of Weak Acids
Acid	Formula	Ka at 25 °C	Lewis Structure
acetic	CH3CO2H	1.8 $\times$ 10−5
arsenic	H3AsO4	5.5 $\times$ 10−3
		1.7 $\times$ 10−7
		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
		4.7 $\times$ 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
	HSe–	1 $\times$ 10−12
hydrogen sulfate ion		1.2 $\times$ 10−2
hydrogen sulfide	H2S	8.9 $\times$ 10−8
	HS–	1.0 $\times$ 10−19
hydrogen telluride	H2Te	2.3 $\times$ 10−3
	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
oxalic	H2C2O4	6.0 $\times$ 10−2
		6.1 $\times$ 10−5
phosphoric	H3PO4	7.5 $\times$ 10−3
		6.2 $\times$ 10−8
		4.2 $\times$ 10−13
phosphorous	H3PO3	5 $\times$ 10−2
		2.0 $\times$ 10−7
sulfurous	H2SO3	1.6 $\times$ 10−2
		6.4 $\times$ 10−8

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