A soluble impurity usually has two effects on the melting point of a compound: an increase in melting point range and a decrease in melting point.
In chemistry, there are two types of impurities: soluble and insoluble.
Soluble impurities are those that dissolve in water quickly and also have a significant impact on the chemical properties of a compound such as melting and boiling points.
For example, salt, milk, and sugar compounds are soluble impurities.
Similarly, insoluble impurities remain undissolved when mixed in water and are also known as suspended impurities.
Examples of insoluble impurities are sand, oil, chalk, rocks, pebbles, etc.
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