Question

Why the titration flask sholud never be rinsed with the solution to be taken in it?​

Answer 1

the burette that you use to add your standard solution during the titration must be rinsed with the standard solution to avoid diluting it. Rinsing glassware with the correct liquid and is also much easier than drying it.

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Answer 2

If the flask to be used for titration is rinsed with a solution, the number of molecules of reactant in the flask will be affected.