Refractive Index and Density of Urea dissolved in Ammonium phosphate's Solution at Different Temperature

Abstract

Densities (ρ) and Refractive Indices η of Urea dissolved in aqueous solutions of Ammonium phosphate’s at 298.15, 303.15 and 308.15 K0. From these experimental data apparent molar volume ( ), limiting partial molar volume ( ) and molar refraction Rm have been calculated we develop an expression we called it limited apparent molar refractivity ( ) that we found it is give the same indication of ( ) about solute-solvent interactions. The results are interpreted from the point of view of solute – solvent and solute – solute interactions in these systems. The results also show that the solvated Urea has the property of breaking structure of liquid water with increasing temperature with this range this result agree with meaning of ( ) derivatives with respect to the temperature.