ULTRASONIC RELAXATION IN ELECTROLYTIC SOLUTIONS. II. THE HYDROLYSIS OF POTASSIUM CYANIDE
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1962
- Accession Number
- AD0285432
Entities
People
- Ernest Yeager
- John Stuehr