Debye's equation for the alternating potential which should accompany the passage of ultrasonic waves through an electrolytic solution is modified and extended by the addition of terms representing corrections for relaxation forces, electrophoretic effects, thermal diffusion, and the pressure gradient associated with the material wave.

1.
A portion of the thesis submitted by E. Yeager and J. Bugosh in partial fulfillment of the requirements for the degree of Master of Science in Chemistry at Western Reserve University, August 1946.
2.
A comprehensive survey (up to 1946) and critical analysis of methods for determining hydration values as well as a compilation of results is included in the thesis (footnote 1). The last published survey of such methods can be found in
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6.
Throughout this mathematical development only the component (x) in the direction of propagation of the ultrasonic wave will be considered.
7.
These approximations can be verified by numerical calculations.
8.
For the dependence of conductivity upon frequency, see H. Falkenhagen, Electrolytes, Trans. by R. P. Bell (Oxford University Press, Oxford, 1934), pp. 182–192.
9.
The choice of the hydrogen atom is made here to facilitate a comparison with the equation of Debye. To be exact, raj mH should be replaced by the mass of the oxygen atom divided by sixteen.
10.
H. Falkenhagen, Electrolytes (Oxford University Press, 1933), p. 170.
11.
N. A. McKenna, Theoretical Electrochemistry (D. Van Nostrand Company, New York, 1938), p. 350.
12.
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Baborovsky
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14.
Although this effect has not been found for electrolytes, the effect has been observed in the case of colloidal solutions.
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15.
In personal correspondence (November 1945).
16.
A.
Rutgers
,
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5
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1938
);
A.
Rutgers
,
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[3977],
74
(
1946
).
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