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Just so, what is back titration example?

In back titration you find the concentration of a species by reacting it with an excess of another reactant of known concentration. Then you titrate the excess reactant. For example, you may want to determine the concentration of a base, but the endpoint is not sharp enough for a precise titration.

Secondly, what are the advantages of a back titration? Advantages of doing back titration 1- Useful if the endpoint of the reverse titration is easier to identify than the endpoint of the normal titration. 2- Useful when trying to work out the amount of an acid or base in a non-soluble solid.

Beside above, why is back titration more accurate?

A back titration is necessary in situations where the reaction you are using to analyse the unknown substance is too slow to respond in a normal titration. In titration, you need the reaction to be able to reach a definite endpoint at practically the same moment as you have reached the stoichiometric equivalence point.

What is the difference between back titration and direct titration?

The main difference between back titration and direct titration is that a back titration determines the concentration of the unknown by determining the remaining amount of the compound with a known concentration whereas a direct titration directly measures the concentration of the unknown compound.