Experiments of Modern Chemistry: Simultaneous Recording of Multiple Cooling Curves

Deacutis, James J.; VanSteele, Donald R.; Bailey, R.A.; Desai, Sudhen B.; Hepfinger, Norbert F.; Hollinger, Henry B.; Locke, P. S.; Miller, Kenneth J.

doi:10.1021/ed074p732

Cited by 4 publications

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“…The liquefied mixture was placed in the cooling curve apparatus and the temperature of cooling was recorded every 10s until temperature reached 10 °C below the measured detected arrest temperature. Break and arrest temperatures were determined from the cooling curves (temperature versus time) (Williams and Collins, 1994;Deacutis et al, 1997). Each measurement was done in triplicate and standard deviation was reported.…”

Section: Methodsmentioning

confidence: 99%

Eutectic System Based on Urea and Potassium Sodium Tartrate

Aguila

Gemperoso

Gabog

et al. 2018

KIMIKA

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Deep eutectic solvents (DESs) are considered as better alternative solvents in chemical and physical processes. The binary mixture of urea and potassium sodium tartrate is explored in this study. A eutectic system is determined at composition made up of 33% potassium sodium tartrate and 67% urea (1:2 molar ratio). This eutectic system has a freezing point of 19.83 ± 0.76 °C, density of 1.1971 ± 0.0003 g mL-1, and viscosity of 34.4226 ± 0.0665 cP. The most stable conformation for the adduct of urea and potassium sodium tartrate with water molecules was determined through density functional calculations. The gas phase total energy for the adduct was determined as -5576863 kJ mol-1. Electrostatic interactions between the cations and the carboxylate sites are present, H-bonding between protons of urea and the hydroxyl oxygen of the tartrate, and intramolecular H-bonding between the hydroxyl and carboxylate sites of tartrate are accounted in the structure. The total energy associated with nonbonding interactions is computed as -826 kJ mol-1, which suggests that these interactions stabilize the formation of the DES system of potassium sodium tartrate and urea.

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Section: Methodsmentioning

confidence: 99%

Eutectic System Based on Urea and Potassium Sodium Tartrate

Aguila

Gemperoso

Gabog

et al. 2018

KIMIKA

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Using LabVIEW to demonstrate instrumentation principles

Jensen

2011

Anal Bioanal Chem

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Mathematical Modeling of Cooling Curve of One Component Phase Transition System

Shi,

Liao,

Duan

et al. 2024

J. Chem. Educ.

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Cooling curves of melts provide a wealth of information regarding latent heat, heat transfer, the Gibbs phase rule, and mass transfer kinetics during phase transition. In this study, a computer-based activity was designed to deepen upper-level undergraduate students’ comprehension of the intricate phase transition process. This activity primarily employs mathematical modeling methods based on conservation of energy and crystallization kinetic equations to derive a mathematical relationship between temperature and time during the supercooling phase transition of a single-component metal. Mathematics teaching software GeoGebra was utilized for graphing and comparing the derived mathematic model with experimental data. Following the activity, students’ learning outcomes were evaluated using a questionnaire. The average score was 86.87 for the first round of students and 88.26 for the second round of students. Incorporating mathematical modeling of cooling curves into physical chemistry laboratory teaching has resulted in noticeable enhancement in the student’s learning. Overall, this activity effectively enhanced students’ comprehension of mathematical modeling, computational skills, and problem solving skills. The activity significantly enriches students’ comprehensive understanding of cooling curves and associated experiments in physical chemistry.

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Experiments of Modern Chemistry: Simultaneous Recording of Multiple Cooling Curves

Abstract: Figure 1: Diagram of experimental assembly.

Cited by 4 publications

References 0 publications

Eutectic System Based on Urea and Potassium Sodium Tartrate

Eutectic System Based on Urea and Potassium Sodium Tartrate

Using LabVIEW to demonstrate instrumentation principles

Mathematical Modeling of Cooling Curve of One Component Phase Transition System

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