Hydrolytic equilibria of metallic ions : I. The hydrolysis of Co(II) ion in NaClO<sub>4</sub> solution
The first acidic ionization constant of Co(II) as cobaltous perchlorate has been determined by a potentiometric titration in a sodium perchlorate medium of constant ionic strength at temperatures ranging from 15 to 40°C and at different concentrations of Co(II) from 2.5 to 25 × 10−3, M and total ion...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1962 |
| País: | Argentina |
| Institución: | Universidad Nacional de La Plata |
| Repositorio: | SEDICI (UNLP) |
| Idioma: | inglés |
| OAI Identifier: | oai:sedici.unlp.edu.ar:10915/121251 |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/121251 |
| Access Level: | acceso abierto |
| Palabra clave: | Ciencias Exactas Química Hydrolysis Cobaltous perchlorate |
| Sumario: | The first acidic ionization constant of Co(II) as cobaltous perchlorate has been determined by a potentiometric titration in a sodium perchlorate medium of constant ionic strength at temperatures ranging from 15 to 40°C and at different concentrations of Co(II) from 2.5 to 25 × 10−3, M and total ionic strength from 0·327 to 0·867. The assembled information indicates the hydrolysis reaction of this ion is a mononuclear reaction where the complex CoOH+ is formed with ΔG<sub>298°</sub> = 13·4 ± 0·2 kcal/mole and ΔH<sub>298°</sub> = 8·2 ± 2·0 kcal/mole. The second acidic ionization constant is higher than the first. This shows that a disproportionation reaction of CoOH+ ions is thermodymanically favoured and has to be considered in the ionic equilibria of aqueous Co(II) ions. |
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