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HSABs
| Species | Acid or Base? | Hard, soft, or borderline? |
|---|---|---|
| F- | Base | Hard |
| Cl- | Base | Hard |
| H20 | Base | Hard |
| OH- | Base | Hard |
| O2- | Base | Hard |
| ROH | Base | Hard |
| RO- | Base | Hard |
| R2O | Base | Hard |
| CH3COO- | Base | Hard |
| NO3- | Base | Hard |
| ClO4- | Base | Hard |
| CO3 2- | Base | Hard |
| SO4 2- | Base | Hard |
| PO4 3- | Base | Hard |
| NH3 | Base | Hard |
| RNH2 | Base | Hard |
| N2H4 | Base | Hard |
| Br- | Base | Border |
| NO2- | Base | Border |
| N3- | Base | Border |
| SO3- | Base | Border |
| C6H5NH2 | Base | Border |
| C5H5N | Base | Border |
| N2 | Base | Border |
| H- | Base | Soft |
| I- | Base | Soft |
| H2S | Base | Soft |
| SH- | Base | Soft |
| S 2- | Base | Soft |
| RSH | Base | Soft |
| RS- | Base | Soft |
| R2S | Base | Soft |
| SCN- | Base | Soft |
| CN- | Base | Soft |
| RNC | Base | Soft |
| CO | Base | Soft |
| S2O3 2- | Base | Soft |
| PR3 | Base | Soft |
| P(OR)3 | Base | Soft |
| AsR3 | Base | Soft |
| C2H4 | Base | Soft |
| C6H6 | Base | Soft |
| H+ | Acid | Hard |
| Li+ | Acid | Hard |
| Na+ | Acid | Hard |
| K+ | Acid | Hard |
| Be 2+ | Acid | Hard |
| Mg 2+ | Acid | Hard |
| Ca 2+ | Acid | Hard |
| Sr 2+ | Acid | Hard |
| BF3 | Acid | Hard |
| BCl3 | Acid | Hard |
| B(OR)3 | Acid | Hard |
| Al 3+ | Acid | Hard |
| Al(CH3)3 | Acid | Hard |
| AlCl3 | Acid | Hard |
| AlH3 | Acid | Hard |
| Cr 3+ | Acid | Hard |
| Mn 2+ | Acid | Hard |
| Fe 3+ | Acid | Hard |
| Co 3+ | Acid | Hard |
| HX | Acid | Hard |
| B(CH3)3 | Acid | Border |
| Fe 2+ | Acid | Border |
| Co 2+ | Acid | Border |
| Ni 2+ | Acid | Border |
| Cu 2+ | Acid | Border |
| Zn 2+ | Acid | Border |
| Rh 3+ | Acid | Border |
| Ir 3+ | Acid | Border |
| Ru 3+ | Acid | Border |
| Os 3+ | Acid | Border |
| BH3 | Acid | Soft |
| Tl + | Acid | Soft |
| Tl(CH3)3 | Acid | Soft |
| Cu + | Acid | Soft |
| Ag + | Acid | Soft |
| Au + | Acid | Soft |
| Cd 2+ | Acid | Soft |
| Hg2 2+ | Acid | Soft |
| Hg 2+ | Acid | Soft |
| CH3Hg + | Acid | Soft |
| [CO(CN)5] 2- | Acid | Soft |
| Pd 2+ | Acid | Soft |
| Pt 2+ | Acid | Soft |
| Pt 4+ | Acid | Soft |
| Br2 | Acid | Soft |
| I2 | Acid | Soft |