Exp 4. Phase Diagram by Differential Scanning Calorimetry (DSC)

소개글

"Exp 4. Phase Diagram by Differential Scanning Calorimetry (DSC)"에 대한 내용입니다.

목차

1. Abstract

2. Introduction

3. Experimental methods
1) Equipment and chemicals
2) Methods

4. Methods

5. Conclusions

본문내용

In this experiment, we use Differential Scanning Calorimetry of Naphthalene and p-dichlorobenzene to figure out the liquid-solid phase diagram in a binary system. Since substances undergo physical or chemical changes through releasing or absorbing heat, we can observe the phase transition by calculating their heat capacity. Before we begin the further experiment, we use indium to calibrate the DSC instrument. Then, make different samples with varying mole fractions of Naphthalene and p-dichlorobenzene and see if there is a change in the heat flux if the mixture has varying proportions of the substances. Lastly, calculate the melting point, molar freezing-point-depression constant, activity coefficient, and eutectic point of the mixture based on the data obtained from the DSC diagram. We can calculate the total heat of fusion by multiplying the molar mass of the substance by the enthalpy of fusion, which is proportional to the area of thermogram times a constant.

참고 자료

Atkins’ physical chemistry 9th edition : chapter 5