pH Calculator

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pH Calculator

Concentration	Unit	Type

Dissociation Constants
Step	Constant K_a pK_a K_b pK_b	Note
1		100% dissociation
2		100% dissociation
3
4

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Name	Formula	step	pKa
Acetic acid	C₂H₄O₂		4.756
Acrylic acid	C₃H₄O₂		4.25
Ammonia	NH₃		9.25
Arsenic acid	H₃AsO₄	1	2.26
		2	6.76
		3	11.29
Arsenious acid	H₃AsO₃		9.29
Boric acid	H₃BO₃	1	9.27
		2	14
Carbonic acid	H₂CO₃	1	6.35
		2	10.33
Chlorous acid	HClO₂		1.94
Chromic acid	H₂CrO₄	1	0.74
		2	6.49
Citric acid	C₆H₈O₇	1	3.13
		2	4.76
		3	6.40
Cyanic acid	HOCN		3.46
Diphosphoric acid	H₄P₂O₇	1	0.91
		2	2.10
		3	6.70
		4	9.32
Formic acid	CH₂O₂		3.75
Germanic acid	H₂GeO₃	1	9.01
		2	12.3
Hydrazine	N₂H₄		8.1
Hydrazoic acid	HN₃		4.6
Hydrogen cyanide	HCN		9.21
Hydrogen fluoride	HF		3.20
Hydrogen peroxide	H₂O₂		11.62
Hydrogen selenide	H₂Se	1	3.89
		2	11.0
Hydrogen sulfide	H₂S	1	7.05
		2	19
Hydrogen telluride	H₂Te	1	2.6
		2	11
Hydroxylamine	H₂NOH		5.94
Hypobromous acid	HOBr		8.55
Hypochlorous acid	HOCl		7.40
Hypoiodous acid	HIO		10.5
Iodic acid	HIO₃		0.78
Nitrous acid	HNO₂		3.25
Orthosilicic acid	H₄SiO₄	1	9.9
		2	11.8
		3	12
		4	12
Oxalic acid	C₂H₂O₄	1	1.25
		2	3.81
Perchloric acid	HClO₄		-1.6
Periodic acid	HIO₄		1.64
Phosphonic acid	H₃PO₃	1	1.3
		2	6.70
Phosphoric acid	H₃PO₄	1	2.16
		2	7.21
		3	12.32
Selenic acid	H₂SeO₄	2	1.7
Selenous acid	H₂SeO₃	1	2.62
		2	8.32
Sulfamic acid	H₂NSO₃H		1.05
Sulfuric acid	H₂SO₄	1	---
		2	1.99
Sulfurous acid	H₂SO₃	1	1.85
		2	7.2
Telluric(VI) acid	H₆TeO₆	1	7.68
		2	11.0
Tellurous acid	H₂TeO₃	1	6.27
		2	8.43
Tetrafluoroboric acid	HBF₄		0.5
Thiocyanic acid	HCNS		-1.8
Test	TEST	1	---
		2	---
		3	1.43
		4	10.43