why hot liquid are not added in barrette in titration
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Titrations can be done either way. You have just been given one example.
It is perfectly usual to have a known acid in a burette running into an unknown base in the conical flask. Generally speaking, the unknown goes in the flask and the standard solution in the burette for a simple titration.
There is also a process known as back titration where, for example, you add an excess of acid to an unknown base, then measure how much acid is left with a standard solution of base. (Same the other way round.) You will learn about this later, I expect, and the reasons for doing it.
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