Journal of Pure and Applied Ultrasonics

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Ultrasonic Behaviour of Dilute Solutions of Water in Amines


Affiliations
1 Sree Lakshmi Sreenivasa Degree College, Pullareddy Peta, Kadapa-516175, India
2 Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India
 

Ultrasonic velocities (u) in dilute solutions of water in diethylamine, triethylamine, dibutylamine and di-sec-butylamine have been determined at 298.15 K using single crystal variable path interferometer working at 3 MHz. Excess ultrasonic velocities (uE) have been evaluated using thermodynamically valid expression. A distinctive non-linear variations of ultrasonic velocity and excess ultrasonic velocity with concentration (X2) of water in all the (amine+water) systems have been observed. The linear variation of u and uE upto certain optimum concentration (X2)opt, observed has been explained as due to the existence of water molecules as monomers distributed uniformly throughout the solutions. The non-linear variations of u and uE versus X2 beyond (X2)opt has been explained in the light of water-water and water-amine interactions leading to the formation of water-amine complexes.
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  • Ultrasonic Behaviour of Dilute Solutions of Water in Amines

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Authors

G. Venkata Ramana
Sree Lakshmi Sreenivasa Degree College, Pullareddy Peta, Kadapa-516175, India
E. Rajagopal
Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India
N. Manohara Murthy
Department of Physics, Sri Krishnadevaraya University, Anantapur-515003, India

Abstract


Ultrasonic velocities (u) in dilute solutions of water in diethylamine, triethylamine, dibutylamine and di-sec-butylamine have been determined at 298.15 K using single crystal variable path interferometer working at 3 MHz. Excess ultrasonic velocities (uE) have been evaluated using thermodynamically valid expression. A distinctive non-linear variations of ultrasonic velocity and excess ultrasonic velocity with concentration (X2) of water in all the (amine+water) systems have been observed. The linear variation of u and uE upto certain optimum concentration (X2)opt, observed has been explained as due to the existence of water molecules as monomers distributed uniformly throughout the solutions. The non-linear variations of u and uE versus X2 beyond (X2)opt has been explained in the light of water-water and water-amine interactions leading to the formation of water-amine complexes.