| Acid-Base Strengths | ||||
|---|---|---|---|---|
 |
Acid | Approximate pKa | Conjugate Base |  |
|
|
||||
| HCl | -7 | Cl - | ||
| H2SO4 | -5 | HSO4- | ||
| H3O + | -2 | H2O | ||
| RCONH3+ | -1 | RCONH2 | ||
| H3PO4 | 2 | H2PO4- | ||
| PhNH3+ | 5 | PhNH2 | ||
| C5H5NH+ | 5 | C5H5N | ||
| RCO2H | 5 | RCO2- | ||
| H2CO3 | 6 | HCO3- | ||
| H2S | 7 | HS- | ||
| PhSH | 7 | PhS- | ||
| NH4+ | 9 | NH3 | ||
| HCN | 9 | CN- | ||
| RCOCH2COR' | 9 | [RCOCHCOR'] - | ||
| PhOH | 10 | PhO- | ||
| HCO3- | 10 | CO3-2 | ||
| RNH3+ | 11 | RNH2 | ||
| CH3SH | 11 | CH3S- | ||
| RCOCH2CO2R' | 11 | [RCOCHCO2R'] - | ||
| HPO42- | 12 | PO43- | ||
| RO2CCH2CO2R' | 13 | [RO2CCHCO2R'] - | ||
| CH3CONH2 | 14 | CH3CONH- | ||
| H2O | 16 | HO - | ||
| RCH2OH | 16 | RCH2O - | ||
| R2CHOH | 17 | R2CHO - | ||
| R3COH | 18 | R3CO - | ||
| RCH2COR' | 18 | [RCHCOR'] - | ||
| RCH2CO2R' | 22 | [RCHCO2R'] - | ||
 |
26 |  |
||
| NH3 | 36 | NH2- | ||
| R2NH | 40 | R2N - | ||
| PhCH3 | 41 | PhCH2- | ||
| Ph | 43 | Ph- | ||
| RH | 62 | R - | ||
| Values below 0 and above 14 are extrapolated from non-aqueous solvents. Compiled in part by Professors Martin Schwartz and Robley Light, Florida State University |
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