Syrakonstanter

Vid temperaturen 298 K.

Syra	Formel	Syrakonstant \(K_a (mol/dm^3)\)	\(pK_a\)
Oxalsyra	\(H_2C_2O_4\)	\(5,9 \cdot 10^{-2}\)	\(1,23\)
Svavelsyrlighet	\(H_2SO_3\)	\(1,5 \cdot 10^{-2}\)	\(1,82\)
Vätesulfatjon	\(HSO^-_4\)	\(1,0 \cdot 10^{-2}\)	\(2,00\)
Fosforsyra	\(H_3PO_4\)	\(7,5 \cdot 10^{-3}\)	\(2,12\)
Salpetersyrlighet	\(HNO_2\)	\(4,7 \cdot 10^{-4}\)	\(3,33\)
Vätefluorid	\(HF\)	\(3,5 \cdot 10^{-4}\)	\(3,46\)
Myrsyra	\(HCOOH\)	\(1,8 \cdot 10^{-4}\)	\(3,74\)
Bensoesyra	\(C_6H_5COOH\)	\(6,5 \cdot 10^{-5}\)	\(4,19\)
Väteoxalatjon	\(HC_2O^-_4\)	\(5,1 \cdot 10^{-5}\)	\(4,29\)
Ättiksyra	\(CH_3COOH\)	\(1,8 \cdot 10^{-5}\)	\(4,74\)
Propansyra	\(C_2H_5COOH\)	\(1,4 \cdot 10^{-5}\)	\(4,85\)
Aluminiumjon	\(Al(H_20)^{3+}_6\)	\(1,0 \cdot 10^{-5}\)	\(5,00\)
Kolsyra	\(H_2CO_3\)	\(4,5 \cdot 10^{-7}\)	\(6,35\)
Divätesulfid	\(H_2S\)	\(8,9 \cdot 10^{-8}\)	\(7,05\)
Vätesulfitjon	\(HSO^-\)	\(6,2 \cdot 10^{-8}\)	\(7,21\)
Divätefosfatjon	\(H_2PO^-_4\)	\(6,2 \cdot 10^{-8}\)	\(7,21\)
Borsyra	\(H_3BO_3 \)	\(5,8 \cdot 10^{-10}\)	\(9,24\)
Ammoniumjon	\(NH^+_4 \)	\(5,6 \cdot 10^{-10}\)	\(9,25\)
Vätecyanid	\(HCN \)	\(4,9 \cdot 10^{-10}\)	\(9,31\)
Vätekarbonatjon	\(HCO^-_3 \)	\(4,8 \cdot 10^{-11}\)	\(10,32\)
Väteperoxid	\(H_2O_2\)	\(2,4 \cdot 10^{-12}\)	\(11,62\)
Vätefosfatjon	\(HPO^{2-}_4 \)	\(4,4 \cdot 10^{-13}\)	\(12,36\)
Vätesulfidjon	\(HS^-\)	\(1,2 \cdot 10^{-13}\)	\(12,92\)