Table of Acid and Base Strength

(see notes at the bottom of the table)

Ka	Acid		Base
	Name	Formula	Formula	Name
Large	Perchloric acid	HClO4	ClO4 ^-	Perchlorate ion
3.2 * 10^9	Hydroiodic acid	HI	I-	Iodide
1.0 * 10^9	Hydrobromic acid	HBr	Br-	Bromide
1.3 * 10^6	Hydrochloric acid	HCl	Cl-	Chloride
1.0 * 10^3	Sulfuric acid	H2SO4	HSO4 ^-	Hydrogen sulfate ion
2.4 * 10^1	Nitric acid	HNO3	NO3 ^-	Nitrate ion
--------	Hydronium ion	H3O+	H2O	Water
5.4 * 10^-2	Oxalic acid	HO2C2O2H	HO2C2O2^-	Hydrogen oxalate ion
1.3 * 10^-2	Sulfurous acid	H2SO3	HSO3 ^-	Hydrogen sulfite ion
1.0 * 10^-2	Hydrogen sulfate ion	HSO4 ^-	SO4 ^2-	Sulfate ion
7.1 * 10^-3	Phosphoric acid	H3PO4	H2PO4 ^-	Dihydrogen phosphate ion
7.2 * 10^-4	Nitrous acid	HNO2	NO3 ^-	Nitrite ion
6.6 * 10^-4	Hydrofluoric acid	HF	F -	Fluoride ion
1.8 * 10^-4	Methanoic acid	HCO2H	HCO2^-	Methanoate ion
6.3 * 10^-5	Benzoic acid	C6H5COOH	C6H5COO-	Benzoate ion
5.4 * 10^-5	Hydrogen oxalate ion	HO2C2O^2-	O2C2O2 ^2-	Oxalate ion
1.8 * 10^-5	Ethanoic acid	CH3COOH	CH3COO	Ethanoate (acetate) ion
4.4 * 10^-7	Carbonic acid	CO3 ^2-	HCO3 ^-	Hydrogen carbonate ion
1.1 * 10^-7	Hydrosulfuric acid	H2S	HS-	Hydrogen sulfide ion
6.3 * 10^-8	Dihydrogen phosphate ion	H2PO4 ^-	HPO4 ^2-	Hydrogen phosphate ion
6.2 * 10^-8	Hydrogen sulfite ion	HS^-	S^2-	Sulfite ion
2.9 * 10^-8	Hypochlorous acid	HClO	ClO^-	Hypochlorite ion
6.2 * 10^-10	Hydrocyanic acid	HCN	CN^-	Cyanide ion
5.8 * 10^-10	Ammonium ion	NH4 ^+	NH3	Ammonia
5.8 * 10^-10	Boric acid	H3BO3	H2BO3 ^-	Dihydrogen borate ion
4.7 * 10^-11	Hydrogen carbonate ion	HCO3 ^-	CO3 ^2-	Carbonate ion
4.2 * 10^-13	Hydrogen phosphate ion	HPO4 ^2-	PO4 ^3-	Phosphate ion
1.8 * 10^-13	Dihydrogen borate ion	H2BO3^-	HBO3 ^2-	Hydrogen borate ion
1.3 * 10^-13	Hydrogen sulfide ion	HS-	S ^2-	Sulfide ion
1.6 * 10^-14	Hydrogen borate ion	HBO3 ^2-	BO3 ^3-	Borate ion
---------	water	H2O	OH-	Hydroxide

1. Strong acids are listed at the top left hand corner of the table and have Ka values greater than 1
2. Acids with Ka values less than one are considered weak acids.
3. The strong bases are listed at the bottom right of the table and get weaker as we move to the top of the table.