Den følgende tabel, giver pKa og Ka værdierne for udvalgte svage syrer. Alle værdierne kommer fra Martell, A. E.; Smitg, R. M. Critical Stability Constants, volumen 1-4. Plenum Press: New York, 1976. Med mindre andet er angivet, er værdierne angivet ved 25 °C og nul ionisk styrke. Værdierne i kantede parenteser, anses for mindre pållidelige.

Svage syrer, arrangeres alfabetisk ved navnene på de neutrale forbindelser, hvorfra de stammer. I nogle tilfælde – som for eksempel eddikesyre – er forbindelsen den svage syre. I andre tilfælde – som for eksempel ammoniumionen – er den neutrale forbindelse den korresponderende base. Kemiske formler eller strukturformler, er vist for det fuldstændigt protonerede svage syre. På hinanden følgende syredissociationskonstanter, er vist for polyprotiske svage syrer; hvor der er tvetydighed, er den specifikke syreproton identificeret.

For at finde Kb værdien for en korresponderende svag base, så husk at:

Ka · Kb = Kw

for en korresponderende svag syre, HA, og dens korresponderende svage base, A^–

Forbindelse	Korresponderende syre	pKa	Ka
Eddikesyre	CH3COOH	4.757	1.75×10–5
Adipinsyre		4.42 5.42	3.8×10–5 3.8×10–6
Alanin		2.348 (COOH) 9.867 (NH3)	4.49×10–3 1.36×10–10
Aminobenzen		4.601	2.51×10–5
4-aminobenzensulfonsyre		3.232	5.86×10–4
2-aminobenzoesyre		2.08 (COOH) 4.96 (NH3)	8.3×10–3 1.1×10–5
2-aminophenol (T = 20 oC)		4.78 (NH3) 9.97 (OH)	1.7×10–5 1.05×10–10
Ammonium	NH4+	9.244	5.70×10–10
Arginin		1.823 (COOH) 8.991 (NH3) [12.48] (NH2)	1.50×10–2 1.02×10–9 [3.3×10–13]
Arsensyre	H3AsO4	2.24 6.96 11.50	5.8×10–3 1.1×10–7 3.2×10–12
Asparagin (μ = 0.1 M)		2.14 (COOH) 8.72 (NH3)	7.2×10–3 1.9×10–9
Asparaginsyre		1.990 (α-COOH) 3.900 (β-COOH) 10.002 (NH3)	1.02×10–2 1.26×10–4 9.95×10–11
Benzoesyre		4.202	6.28×10–5
Benzylamin		9.35	4.5×10–10
Borsyre (pKa2, pKa3:T = 20 oC)	H3BO3	9.236 [12.74] [13.80]	5.81×10–10 [1.82×10–13] [1.58×10–14]
Kulsyre	H2CO3	6.352 10.329	4.45×10–7 4.69×10–11
Catechol		9.40 12.8	4.0×10–10 1.6×10–13
Chloreddikesyre	ClCH2COOH	2.865	1.36×10–3
Chromsyre (pKa1:T = 20 oC)	H2CrO4	-0.2 6.51	1.6 3.1×10–7
Citronsyre		3.128 (COOH) 4.761 (COOH) 6.396 (COOH)	7.45×10–4 1.73×10–5 4.02×10–7
Cupferron (μ = 0.1 M)		4.16	6.9×10–5
Cystein		[1.71] (COOH) 8.36 (SH) 10.77 (NH3)	[1.9×10–2] 4.4×10–9 1.7×10–11
Dichloreddikesyre	Cl2CHCOOH	1.30	5.0×10–2
Duethylamin	(CH3CH2)2NH2+	10.933	1.17×10–11
Dimethylamin	(CH3)2NH2+	10.774	1.68×10–11
Dimethylglyoxim		10.66 12.0	2.2×10–11 1.×10–12
Ethylamin	CH3CH2NH3+	10.636	2.31×10–11
Ethylendiamin	+H3NCH2CH2NH3+	6.848 9.928	1.42×10–7 1.18×10–10
Ethylendiamintetraeddikesyre (EDTA) (μ = 0.1 M)		0.0 (COOH) 1.5 (COOH) 2.0 (COOH) 2.66 (COOH) 6.16 (NH) 10.24 (NH)	1.0 3.2×10–2 1.0×10–2 2.2×10–3 6.9×10–7 5.8×10–11
formic acidMyresyre	HCOOH	3.745	1.80×10–4
Fumarsyre		3.053 4.494	8.85×10–4 3.21×10–5
Glutaminsyre		2.33 (α-COOH) 4.42 (λ-COOH) 9.95 (NH3)	5.9×10–3 3.8×10–5 1.12×10–10
Glutamin (μ = 0.1 M)		2.17 (COOH) 9.01 (NH3)	6.8×10–3 9.8×10–10
Glycin +H3NCH2COOH		2.350 (COOH) 9.778 (NH3)	4.47×10–3 1.67×10–10
Glycolsyre	HOOCH2COOH	3.831 (COOH)	1.48×10–4
Histidin (μ = 0.1 M)		1.7 (COOH) 6.02 (NH) 9.08 (NH3)	2.×10–2 9.5×10–7 8.3×10–10
Hydrogencyanid	HCN	9.21	6.2×10–10
Hydrogenfluorid	HF	3.17	6.8×10–4
Hydrogenperoxid	H2O2	11.65	2.2×10–12
Hydrogensulfid	H2S	7.02 13.9	9.5×10–8 1.3×10–14
Hydrogenthiocyanat	HSCN	0.9	1.3×10–1
8-hydroxyquinolin		4.91 (NH) 9.81 (OH)	1.2×10–5 1.6×10–10
Hydroxylamin	HONH3+	5.96	1.1×10–6
Hypobromsyre	HOBr	8.63	2.3×10–9
Hypochlorsyre	HOCl	7.53	3.0×10–8
Hypoiodsyre	HOI	10.64	2.3×10–11
Iodsyre	HIO3	0.77	1.7×10–1
Isoleucin		2.319 (COOH) 9.754 (NH3)	4.80×10–3 1.76×10–10
Leucin		2.329 (COOH) 9.747 (NH3)	4.69×10–3 1.79×10–10
Lysin (μ = 0.1 M)		2.04 (COOH) 9.08 (α-NH3) 10.69 (ε-NH3)	9.1×10–3 8.3×10–10 2.0×10–11
Maleinsyre		1.910 6.332	9.1×10–3 9.1×10–3
Æblesyre		3.459 (COOH) 5.097 (COOH)	9.1×10–3 9.1×10–3
Malonsyre	HOOCCH2COOH	2.847 5.696	9.1×10–3 9.1×10–3
Methionin (μ = 0.1 M)		2.20 (COOH) 9.05 (NH3)	9.1×10–3 9.1×10–3
Methylamin	CH3NH3+	10.64	9.1×10–3
2-methylanalin		4.447	9.1×10–3
4-methylanaline		5.084	9.1×10–3
2-methylphenol		10.28	9.1×10–3
4-methylphenol		10.26	9.1×10–3
Nitrilotrieddikesyre (T = 20 oC) (pKa1: μ = 0.1 m)		1.1 (COOH) 1.650 (COOH) 2.940 (COOH) 10.334 (NH3)	9.1×10–3 9.1×10–3 9.1×10–3 9.1×10–3
2-nitrobenzoesyre		2.179	9.1×10–3
3-nitrobenzoesyre		3.449	9.1×10–3
4-nitrobenzoesyre		3.442	3.61×10–4
2-nitrophenol		7.21	6.2×10–8
3-nitrophenol		8.39	4.1×10–9
4-nitrophenol		7.15	7.1×10–8
Salpetersyrling	HNO2	3.15	7.1×10–4
Oxalsyre	H2C2O4	1.252 4.266	5.60×10–2 5.42×10–5
1,10-phenanthrolin		4.86	1.38×10–5
Phenol		9.98	1.05×10–10
Phenylalanin		2.20 (COOH) 9.31 (NH3)	6.3×10–3 4.9×10–10
Phosphorsyre	H3PO4	2.148 7.199 12.35	7.11×10–3 6.32×10–8 4.5×10–13
phthalsyre		2.950 5.408	1.12×10–3 3.91×10–6
Piperidin		11.123	7.53×10–12
Prolin		1.952 (COOH) 10.640 (NH)	1.12×10–2 2.29×10–11
Propansyre	CH3CH2COOH	4.874	1.34×10–5
Propylamin	CH3CH2CH2NH3+	10.566	2.72×10–11
Pyridin		5.229	5.90×10–6
Resorcinol		9.30 11.06	5.0×10–10 8.7×10–12
Salicylsyre		2.97 (COOH) 13.74 (OH)	1.1×10–3 1.8×10–14
Serin		2.187 (COOH) 9.209 (NH3)	6.50×10–3 6.18×10–10
Ravsyre		4.207 5.636	6.21×10–5 2.31×10–6
Svovlsyre	H2SO4	strong 1.99	— 1.0×10–2
Svovlsyrling	H2SO3	1.91 7.18	1.2×10–2 6.6×10–8
D-vinsyre		3.036 (COOH) 4.366 (COOH)	9.20×10–4 4.31×10–5
Threonin		2.088 (COOH) 9.100 (NH3)	8.17×10–3 7.94×10–10
Thiosvovlsyre	H2S2O3	0.6 1.6	3.×10–1 3.×10–2
Trichloreddikesyre (μ = 0.1 M)	Cl3CCOOH	0.66	2.2×10–1
Triethanolamin	(HOCH2CH2)3NH+	7.762	1.73×10–8
Triethylamin	(CH3CH2)3NH+	10.715	1.93×10–11
Trimethylamin	(CH3)3NH+	9.800	1.58×10–10
tris(hydroxymethyl)aminomethan (TRIS or THAM)	(HOCH2)3CNH3+	8.075	8.41×10–9
Tryptophan (μ = 0.1 M)		2.35 (COOH) 9.33 (NH3)	4.5×10–3 4.7×10–10
Tyrosin (pKa1: μ = 0.1 M)		2.17 (COOH) 9.19 (NH3) 10.47 (OH)	6.8×10–3 6.5×10–10 3.4×10–11
Valin		2.286 (COOH) 9.718 (NH3)	5.18×10–3 1.91×10–10