Abstract
Ultrasonic absorption measurements have been made in aqueous potassium cyanide solutions by the spherical resonator, statistical reverberation, and pulse-reflector techniques at frequencies from 40 kc to 25 Mc. Only one relaxation frequency has been found in this range. For a KCN concentration of 0.05 mole/liter at 25°C, the relaxation frequency is 900 kc with an excess absorption per wave length (αλ) at this frequency equal to 9.0×10−5. The dependence of the absorption on concentration also has been measured. The experimental data support the conclusion that an hydrolysis reaction involving the reaction of the cyanide ion with water is responsible for the abnormal absorption. The relaxation data have been used to calculate the rate constants for this hydrolysis reaction. (This research has been supported by the Office of Naval Research.)
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