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|Title:||Effect of ammonium halides on the temperature of sound velocity maximum of water|
|Authors:||Ramana, G Venkata|
Murthy, N Manohara
|Abstract:||Effect of ammonium halides on the temperature of sound velocity maximum (TSVM) of water has been studied by determining the ultrasonic velocity with an accuracy of ± 0.003 % using single- crystal variable-path interferometer working at 3 MHz. The velocity measurements were carried out at = 2°C intervals over a range of 5 °C to either side of the TSVM of the solutions. The accuracy in fixing the TSVM is ± 0.2 °C. The shift in TSVM of water due to the addition of the NH4Cl, Δ Tobs is found to be positive up to w = 3.4×10-2 and negative thereafter, where w represents weight fraction of the solute. The shifts in TSVM of water due to the addition of the NH4Br and NH4I are found to be negative throughout the concentration range. The structural contribution to the shift in TSVM of water, ΔTstr , is found to be positive for NH4Cl and increases with increase in the concentration nonlinearly. ΔTstr for NH4Br is almost zero up to w = 3×10-2 and thereafter becomes negative. ΔTstr for NH4I is found to be negative throughout the concentration range. The results are explained in terms of the structure, making and breaking nature of anions and cations present in the solutions.|
|ISSN:||0975-1041 (Online); 0019-5596 (Print)|
|Appears in Collections:||IJPAP Vol.40(10) [October 2002]|
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