# Very quick question regarding melting point and purity

• daselocution
In summary, based on the given melting point of 147ºC (dec.), it can be concluded that the sample may contain a reactive impurity, possibly a strong mineral acid or oxidizer. Further information about the expected behavior of a pure sample is needed to determine the exact level of purity.
daselocution

## Homework Statement

For the following melting point, indicate what might be concluded regarding the sample purity:

Melting point: 147ºC (dec.)

## Homework Equations

I assume that (dec.) means that the sample decomposed.

## The Attempt at a Solution

I am wondering if this means that the sample is practically 100% pure because it decomposed in such a small temperature window, or if the fact that the sample decomposed means that no useful information can be obtained.

I would say the latter unless you know something more about how a pure sample of the analyte should behave. If it is supposed to melt and it decomposes, you have a reactive impurity. In my experience, reactive impurities mean strong mineral acids or oxidizers.

1 person

## 1. What is a melting point?

A melting point is the temperature at which a solid substance changes into a liquid state. It is a characteristic physical property of a substance and is often used to identify and determine the purity of a substance.

## 2. How is melting point related to purity?

In general, the purer a substance is, the higher its melting point will be. Impurities in a substance can lower its melting point or cause it to have a broader range of melting temperatures. Therefore, a higher melting point usually indicates a higher level of purity.

## 3. What factors can affect the melting point of a substance?

The melting point of a substance can be affected by factors such as impurities, pressure, and the rate at which it is heated. Other factors such as the size and shape of the substance can also influence its melting point.

## 4. How is the melting point of a substance determined?

The melting point of a substance is usually determined by heating a sample of the substance and monitoring its temperature as it changes from a solid to a liquid. This is typically done using a specialized piece of equipment called a melting point apparatus.

## 5. Why is it important to know the melting point and purity of a substance?

Knowing the melting point and purity of a substance is important for a variety of reasons. It can help identify and characterize unknown substances, ensure the quality and consistency of products, and aid in the development of new materials and medicines. It is also essential for following proper safety protocols and handling substances correctly.

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