Answer to Question #233844 in General Chemistry for Qistina

Question

why is the beaker not suitable to be used in preparing a standard solution by dilution method?

Answer 1

Assuming the beaker is the vessel in which the reaction takes place, it must be clean. If it is rinsed with distilled water, that’s fine. If it is rinsed with the solution under test that’s not fine - that will affect the number of molecules of reactant in the beaker.

On the other hand … The pipette that you use to load the beaker must be rinsed with the solution under test to maintain its concentration. Likewise, the burette that you use to add your standard solution during the titration must be rinsed with the standard solution to avoid diluting it.