Kinetics of Gold Dissolution in Thiosemicarbazide Solutions

The kinetics of gold dissolution in thiosemicarbazide solutions was studied relative to the ratio of ferric ion and thiosemicarbazide concentrations as well as pH. The composition of the complex formed was found to be [Au(NH₂)₂NHC=S₃]⁺. The rate constants for gold dissolution were determined at 278-298 K along with the stability, dissociation, and equilibrium constants at 288 K. The activation energy at 288 K was also found.     

Kinetics of the reduction of water by activated aluminum powder

Experimental investigations of the kinetics of reduction of water when it is reacted with activated aluminum suggest that the mechanisms for the processes at low and high temperatures differ in the activation energy and the pre-exponential factor. This is explained on the basis of the theory we developed previously for electron transfers from the solid phase to antibonding orbitals of the H₂O via tunneling and activation mechanisms.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 31, No. 4, pp. 238–242, July–August, 1995.