Know what is meant by melting point range. Know what kind of information about a

Question

Know what is meant by melting point range. Know what kind of information about a sample can be determined from its melting point. Know what happens to the melting point of a pure compound if it is contaminated by impurities. Know how to determine if two samples that have the same melting point are identical or not. Understand why it is important to slowly raise the temperature of the melting point apparatus in order to obtain an accurate melting point. Know when/why you should measure the evacuated melting point of a compound. Know how to determine the melting point of an unknown sample without having to raise the temperature slowly over a large temperature range. Know how to prepare a sealed capillary and to prepare a sample for melting point.

Explanation / Answer

1. Melting point ragne is a temperature range in which a solid substance is converted into its liquid form completely at atmospheric pressure.

2. From the melting point temperature we may know the state of the substance at room temperature.

For example a compound has melting point which less than room temperature then it may be liquid.

If a compound has melting point which is greater than room temperature then it is soild.

3. If impurity is soluble in compound then melting point of compound will be lowered.

4. Using other chemical test like solubility we may know the compounds are identical or not.

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