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Hace 2 días · When using modified cobalt and rhodium carbonyl complexes as catalysts, promoters—pyridine and trialkyl or phenyl phosphines—were introduced into the reactor along with catalyst solutions. Upon reaching the operating temperature, sinapyl alcohol was forced from the loading vessel into the reactor by the synthesis gas at pressure adjusted to 29.4 MPa.
Co (H 2 O) 62+aq + 4 Cl -aq (+ heat) → CoCl 42-aq + 3 H 2 O l. The blue form is anhydrous and tetrahedral coordinated, the pink form is hydrated and is octahedral coordinated. ΔH = ~42-54kJ/mol. Conc. HCl is not only a source of Cl - but also has a dehydrating effect.
The distinctive colours of the two cobalt(II) species in solution produce an attractive visual demonstration of a reversible reaction and the effect of concentration and temperature on the position of equilibrium.
This process relies heavily on solubility and precipitation processes governed by solubility equilibria (with equilibrium constants know as \(K_{sp}\).) as well as complex formation equilibria (with equilibrium constants represented by \(K_f\) or \(\beta\) ). Consider the solubility of AgCl.
To demonstrate the shift in equilibrium caused by a change of temperature and a change in concentration.
We begin by dissolving the Cobalt Chloride in water, forming the pink hydrous form. The system’s equilibrium is then stressed by adding substances that affect concentrations or other parameters. 2- 2 [CoCl 4] (aq) 6H 2O (l)[Co(H 2O) 6] (aq) 4Cl (aq) + ++! (blue) (pink)
22 de dic. de 2017 · The first two complexes are cationic and are formed by Co 2+ cations coordinated by two TEA ligands plus nitrate or succinate anions, respectively. The equilibrium geometries of the [Co(TEA) 2] 2+ cations have been optimized at the B3LYP/cc-pVDZ level.
