Accession Number : AD0285432

Title :   ULTRASONIC RELAXATION IN ELECTROLYTIC SOLUTIONS. II. THE HYDROLYSIS OF POTASSIUM CYANIDE

Corporate Author : ULTRA ELECTRIC LTD LONDON (ENGLAND)

Personal Author(s) : STUEHR,JOHN ; YEAGER,ERNEST

Report Date : 01 SEP 1962

Pagination or Media Count : 1

Abstract : The kinetics of the hydrolysis of the cyanide ion have been studied by ultrasonic absorption measurements over the frequency range 30 kc to 25 mc. A single relaxation frequency has been observed which depends on concentration in the manner expected theoretically for the hydrolysis reaction. The relaxation frequency at 25 C is 450 kc for a 0.01 M solution and 950 kc for 0.05 M. The corresponding forward and reverse rate constants calculated for the reaction (CN ion + H2O equals HCN + OH ion) are K sub 1 equals 5.2 x 10 to the 4th power per sec and K sub minus 1 equals 3.7 x 10 to the 9th power at 25 C. From the magnitude of the maximum excess acoustic absorption per wavelength (90 x 10 to the minus 6th power at 25 C for the 0.05 M solution) the partial molal volume change delta V for the process was calculated as -12.4 cu cm/mol. The temperature dependence of the relaxation frequency indicates an energy of activation for the process HCN + OH ion yields CN ion + H2O of 6 ! 2 Kcal/mol. (Author)

Descriptors :   *CYANIDES, *HYDROLYSIS, *POTASSIUM COMPOUNDS, *ULTRASONIC RADIATION, ABSORPTION, CHEMICAL EQUILIBRIUM, CHEMICAL REACTIONS, ENTHALPY, REACTION KINETICS, RELAXATION TIME, SOLUTIONS(MIXTURES), THEORY

Distribution Statement : APPROVED FOR PUBLIC RELEASE