Acid	Formula	Ka
Ammonium ion	NH4+	5.70 x 10-10
Carbonic acid	H2CO3	4.45 x 10-7  4.69 x 10-11
Boric acid	H3BO3	5.81 x 10-10
Dimethyl ammonium ion	(CH3)3NH2+	1.68 x 10-11
Ethyl ammonium ion	C2H5NH3+	2.31 x 10-11
Formic acid	HCOOH	1.80 x 10-4
Hydrochloric acid	HCl	Strong
Hydrogen bromide	HBr	Strong
Hydrogen cyanide	HCN	6.2 x 10-10
Hydrogen fluoride	HF	6.80 x 10-4
Hydrogen sulfide	H2S	9.5 x 10-8  1.3 x 10-14
Hydroxyl ammonium ion	HONH3+	1.10 x 10-6
Hypochlorous acid	HOCl	3.0 x 10-8
Methyl ammonium ion	CH3NH3+	2.3 x 10-11
Nitric acid	HNO3	Strong
Nitrous acid	HNO2	7.1 x 10-4
Oxalic acid	H2C2O4	5.60 x 10-2  5.42 x 10-5
Perchloric acid	HClO4	Strong
Phosphoric acid	H3PO4	7.11 x 10-3  6.32 x 10-8 7.1 x 10-13
Sulfuric acid	H2SO4	Strong  1.20 x 10-2
Trimethylamine	(CH3)3NH+	1.58 x 10-10