Abstract
A spectrophotometric study has been made of an aqueous solution of silver(II) containing nitric acid and an excess of 2,2′-bipyridine over the wavelength range 350–550 nm. The data are consistent with the existence of only two complexes related by the equilibrium [Ag(bipy)2]2++ H+⇌[Ag(bipy)]2++ Hbipy+. At I= 1.00 mol dm–3 and at 25 °C, Kh for this equilibrium is found to be (3.3 ± 0.5)× 10–3. From the variation of Kh with temperature the values for the enthalpy and entropy of the above reaction are found to be 11.5 ± 2.6 kJ mol–1 and –9 ± 10 J K–1 mol–1 respectively.
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