Thermo-Acoustic Behaviour of K2CrO4 and K4 [Fe(CN)6] in Aqueous Dimethylformamide at Different Temperatures

Rajalaxmi Panda, Subhraraj Panda, Susanta Kumar Biswal
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Abstract

Acoustic parameters can help us understand how temperature and concentration affect the behaviour of potassium ferrocyanide and potassium chromate electrolytes in the aqueous solvent Dimethylformamide. The solution's density (ρ), viscosity (η), and ultrasonic speed (u) were measured at various concentrations and temperatures (ranging from 293 K to 313 K) using a pycnometer, an Ostwald viscometer, and an ultrasonic interferometer at frequencies of 1MHz, respectively. Based on these measurements, other acoustic parameters were calculated, such as free length (Lr), internal pressure (πi), adiabatic compressibility (β), acoustic impedance (Z), relaxation time (τ), and Gibbs free energy (ΔG). These acoustic and thermodynamic parameters were used to explore various interactions, molecular motion, and interaction modes, as well as their effects, which were influenced by the size of the pure component and the mixtures. The analysis showed that changes in temperature and concentration led to specific parameter differences, which affected the interactions between the solute and solvent. This study demonstrated that increasing the concentration of the mixture increased the density, viscosity, and ultrasonic velocity due to the interaction between the solute and solvent, indicating molecular interaction in the mixture.
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K2CrO4 和 K4 [Fe(CN)6] 在二甲基甲酰胺水溶液中不同温度下的热声行为
声学参数有助于我们了解温度和浓度如何影响亚铁氰化钾和铬酸钾电解质在水性溶剂二甲基甲酰胺中的行为。在不同浓度和温度(从 293 K 到 313 K)下,使用温度计、奥斯特瓦尔德粘度计和频率为 1MHz 的超声干涉仪分别测量了溶液的密度 (ρ)、粘度 (η) 和超声波速度 (u)。这些声学和热力学参数被用来探索各种相互作用、分子运动和相互作用模式,以及它们受纯组分和混合物大小影响的效应。分析表明,温度和浓度的变化会导致特定参数的差异,从而影响溶质和溶剂之间的相互作用。这项研究表明,由于溶质和溶剂之间的相互作用,混合物浓度的增加会提高密度、粘度和超声波速度,这表明混合物中存在分子相互作用。
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