Study of intermolecular interactions in binary mixtures of formamide with 2-propanol, 1,2-propanediol and 1,2,3-propanetriol through ultrasonic speed measurements

Abstract

Densities, ρ, and ultrasonic speeds, <i>u. </i>have been measured in binary mixtures of formamide with 2-propanol, 1,2 - propanediol and 1,2,3-propanetriol over the entire composition range at 308 K. From the experimental values of ρ and <i>u,</i>

<span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">the values of isentropic compressibilities, <i>K</i>_s<i>, </i>intermolecular free lengths, <i>L</i>_f<i> </i>relative associations, <i>R</i>_A<i> </i>, acoustic impedances. Z, deviations in isentropic compressibilities, Δ<i>K</i>_s<i>, </i>excess volumes, <i>V</i>^E, deviations in ultrasonic speeds,Δ<i> u, </i>and excess acoustic impedances,Z^E, for all the three systems were calculated. The behaviour of these parameters with composition of the mixtures have been discussed in terms of molecular interactions between component liquids. Moreover, The experimental values of ultrasonic speeds were compared with those calculated by using collision factor theory (CFT), free length theory (FLT), Nomoto's relation and Van Dael <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">and Vangeel <span style="font-size:14.0pt;line-height:115%;font-family:" times="" new="" roman";="" mso-fareast-font-family:"times="" roman";color:black;mso-ansi-language:en-in;="" mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">relation. The suitability of these theories and relations in reproducing the experimental ultrasonic speeds is <span style="font-size:14.0pt;line-height:115%;font-family: " times="" new="" roman";mso-fareast-font-family:hiddenhorzocr;color:black;mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:hi"="" lang="EN-IN">discussed.</span></span></span></span>