Answer :
It be better to use an unknown acid sample of a size that should require 10 ml or one that would require 15 ml of titrant.
Define titration process.
Titration is a method of chemical analysis where the amount of a sample's ingredient is determined by adding an exact known amount of a different substance to the measured sample in which the desired constituent interacts in a specific, known proportion.
It doesn't matter how much titrant is needed; what matters is how to get to the titration's end point.
Although an unknown acid sample of a size that should require 10.00 ml of titrant will be better to reduce the time of mathematically calculation only.
Therefore, it be better to use an unknown acid sample of a size that should require 10 ml or one that would require 15 ml of titrant.
To learn more about titration process from the given link.
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