Accession Number:

AD0285432

Title:

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

Descriptive Note:

Corporate Author:

ULTRA ELECTRIC LTD LONDON (ENGLAND)

Personal Author(s):

Report Date:

1962-09-01

Pagination or Media Count:

1.0

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 cmmol. 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 Kcalmol. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE