explain why melting and boiling points can be used as a way to check purity
Answers
Answer:
If the boiling point is low then it means that the substance is pure because the boiling point would be higher if it had impurities in it.
Answer:
The physical properties of a substance can be used to establish its purity. ... However, the presence of impurities will cause a lower melting point as well as a change in boiling point.
Explanation:
Usually impurities have lower melting/boiling point, thus evaporates earlier can be removed. - However, pure compounds have high melting/boiling points and evaporates very slowly. - This is how we can check purity of compounds (usually fuels).
Impurities, even when present in small amounts, usually lower the melting point and broaden the melting point range. A wide melting point range (more than 5°C) usually indicates that the substance is impure; a narrow melting point range (O. 5-2°C) usually indicates that the substance is fairly pure.