Question

why it is simpler to identify a pure substance that it is to identify the components of a mixture?

what are the advantages of spot tests?

Answer 1

Solution:

The identification of a pure substance is easier than the components of a mixture because a pure substance has a sharp melting and boiling points. The melting and boiling point of components in the mixture is broad and variable, therefore separation becomes difficult.

Spot test:

Spot test requires a small amount of reagents.

It is highly sensitive method for the identification.

It is most easiest technique.

It required only one drop of solution for the identification of sample.