Simple Distillation
Determination of Melting and Boiling Point of different Organic Compounds
Bakare, Abimbola Kristine, C.
Professor Miranda Marilyn, school of chemical engineering and biotechnology, Mapua Institute of Technology, CHM145L-B11 ABSTRACT
A melting point of a solid is the temperature at which the first crystal just starts to melt until the temperature at which the last crystal just disappears. Thus, the melting point (m.p.) is actually a melting range. The melting point of a substance depends (usually slightly) on pressure and is usually specified at standard pressure. The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. In this experiment we were be able would use various apparatus to determining the melting point and boiling point of organic compounds. We realized that boiling point and melting is affected by pressure, molecular weight, structure, intermolecular interactions and most of all impurities present in the compound.
INTRODUCTION
The melting point of a substance is the temperature at which the material changes from a solid to a liquid state. Pure crystalline substances have a clear, sharply defined melting point. During the melting process, all of the energy added to a substance is consumed as heat of fusion, and the temperature remains constant. A pure substance melts at a precisely defined temperature, characteristic of every crystalline substance and dependent only on pressure (though the pressure dependency is generally considered insignificant). Determining the MP is a simple and fast method used in many diverse areas of chemistry to obtain a first impression of the purity of a substance. This is because even small quantities of impurities change the melting point, or at least clearly enlarge its melting range.
The boiling point of a liquid is the special case in which the vapor pressure of the liquid equals the defined
Bakare, Abimbola Kristine, C.
Professor Miranda Marilyn, school of chemical engineering and biotechnology, Mapua Institute of Technology, CHM145L-B11 ABSTRACT
A melting point of a solid is the temperature at which the first crystal just starts to melt until the temperature at which the last crystal just disappears. Thus, the melting point (m.p.) is actually a melting range. The melting point of a substance depends (usually slightly) on pressure and is usually specified at standard pressure. The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. In this experiment we were be able would use various apparatus to determining the melting point and boiling point of organic compounds. We realized that boiling point and melting is affected by pressure, molecular weight, structure, intermolecular interactions and most of all impurities present in the compound.
INTRODUCTION
The melting point of a substance is the temperature at which the material changes from a solid to a liquid state. Pure crystalline substances have a clear, sharply defined melting point. During the melting process, all of the energy added to a substance is consumed as heat of fusion, and the temperature remains constant. A pure substance melts at a precisely defined temperature, characteristic of every crystalline substance and dependent only on pressure (though the pressure dependency is generally considered insignificant). Determining the MP is a simple and fast method used in many diverse areas of chemistry to obtain a first impression of the purity of a substance. This is because even small quantities of impurities change the melting point, or at least clearly enlarge its melting range.
The boiling point of a liquid is the special case in which the vapor pressure of the liquid equals the defined
References: http://wiki.answers.com/Q/What_is_melting_point_and_boiling_point http://www.teacherlink.org/content/science/instructional/activities/melting/Melting-print.PDF http://en.wikipedia.org/wiki/Melting_point http://ochemonline.pbworks.com/f/04_mp.pdf http://masterorganicchemistry.com/2010/10/25/3-trends-that-affect-boiling-points/