Acetic acid 

CH₃COOH 

1.8x10^-5 

Acetylsalicylic acid (aspirin)

HC₉H₇O₄

3.0x10^-4

Aluminum ion 

Al(H₂O)₄³⁺ 

1.2x10^-5 

Arsenic acid 

H₃AsO₄

2.5x10^-4

5.6x10^-8

3.0x10^-13

Ascorbic acid

H₂C₆H₆O₆

7.9x10^-5

1.6x10^-12

Benzoic acid

C₆H₅COOH

6.3x10^-5

Carbonic acid 

H₂CO₃ 

4.2x10^-7 

4.8x10^-11

Ferric ion 

Fe(H₂O)₆³⁺ 

4.0x10^-3 

Formic acid 

HCOOH 

1.8x10^-4 

Hydrocyanic acid 

HCN 

4.0x10^-10 

Hydrofluoric acid 

HF 

7.2x10^-4 

Hydrogen peroxide 

H₂O₂ 

2.4x10^-12 

Hydrosulfuric acid 

H₂S 

1.0x10^-7 

1.0x10^-19

Hypochlorous acid

HClO 

3.5x10^-8 

Nitrous acid 

HNO₂ 

4.5x10^-4 

Oxalic acid 

H₂C₂O₄ 

5.9x10^-2 

6.4x10^-5

Phenol

C₆H₅OH

1.0x10^-10

Phosphoric acid

H₃PO₄ 

7.5x10^-3 

6.2x10^-8

3.6x10^-13

Sulfuric acid

H₂SO₄ 

very large 

1.2x10^-2

Sulfurous acid

H₂SO₃

1.7x10^-2

6.4x10^-8

Zinc ion 

Zn(H₂O)₄²⁺ 

2.5x10^-10 

Ammonia 

NH₃ 

1.8x10^-5 

Aniline

C₆H₅NH₂

7.4x10^-10

Caffeine

C₈H₁₀N₄O₂

4.1x10^-4

Codeine

C₁₈H₂₁O₃N

8.9x10^-7

Diethylamine

(C₂H₅)₂NH

6.9x10^-4

Dimethylamine

(CH₃)₂NH

5.9x10^-4

Ethylamine

C₂H₅NH₂

4.3x10^-4

Hydroxylamine

NH₂OH

9.1x10^-9

Isoquinoline

C₉H₇N

2.5x10^-9

Methylamine

CH₃NH₂

4.2x10^-4

Morphine

C₁₇H₁₉O₃N

7.4x10^-7

Piperidine

C₅H₁₁N

1.3x10^-3

Pyridine

C₅H₅N

1.5x10^-9

Quinoline

C₉H₇N

6.3x10^-10

Triethanolamine

C₆H₁₅O₃N

5.8x10^-7

Triethylamine

(C₂H₅)₃N

5.2x10^-4

Trimethylamine

(CH₃)₃N

6.3x10^-5

Urea

N₂H₄CO

1.5x10^-14