Answer :
if a compound is pure, melting point should be close to the expected value and very narrow (1-2°c).
if a compound is impure, containing traces of starting material or byproduct, melting point is expected to be lower than the expected range and broad.
if a compound is wet with water or residual solvent, melting point is expected to be lower than the expected range and broad.
What is the difference between pure compound and impure compound?
In simple terms, matter can be defined as anything and everything that has mass and occupies space. Everything from air you breathe, the water you drink, or the clothes you wear comes under the category of matter. It is made up of an elementary particle referred to as an atom. A further matter is subdivided into two the primary categories which are –
- Pure substances
- Impure substances
Pure and impure substances are different from one another and have the distinctive characteristics. Now, let’s look into them in the detail to get a clear understanding of Characteristics of a pure and impure substances.
When single types of atoms are combined together, it results in the formation of the pure substances. As a result, these substances possess the homogeneous chemical compositions and hold a fixed structure and chemical properties.
Impure substances, also known as the mixtures, are another type of matter formed through different kinds of molecules or atoms. The stature of these is not fixed or constant, unlike the pure substances. They can be broken down into the pure substances with the help of purification methods such as sublimation, filtration, crystallization, and so on.
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