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MELTING POINT OF ORGANIC COMPOUNDS

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  • Essay length: 1858 words
  • Submitted: 18/08/2009
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University Degree Cell Biology

The first 200 words of this essay...

NAME : THAMARAI A/P RAJENDRAN

ID NUMBER : 09ALB07214

LABORATORY 1A : ATOMIC STRUCTURE, BONDING AND PERIODICITY

COURSE : BIOTECHNOLOGY (YEAR 1 SEM 1)

EXPERIMENT 7:

MELTING POINT OF ORGANIC COMPOUNDS.

TITLE:

Melting Point of Organic Compounds.

OBJECTIVES OF EXPERIMENT:

The objective of this experiment is to identify unknown organic compound by melting point depression method. Practice use of melting point apparatus by measuring melting point of some pure organic compound.

THEORY AND BACKGROUND:

The melting point of organic solid can be determined by introducing a tiny amount of the substance into a small capillary tube, attaching this to the stem of a thermometer centerd in heating bath, heating the bath slowly, and observing the temperatures at which melting begins and is complete. Pure samples usually have sharp melting points, for example 149.5°C-150°C or 189°C-190°C; impure samples of the same compounds melt at lower temperatures and over a wide range, for example; 145°C-148°C or 187°C-189°C. The contaminant that depresses the melting point and extends the melting range may be an indefinitely characterized resinous material or it may be a trace of a second chemical entity

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