[kangbear50]

Hi guys, just a question, Why is it important to use the same pipette and glassware throughout the entire titration?

[Arkcon]

Why do you think?

(This is just a little reminder that you are supposed to show some work of your own on this forum, even for a question such as this, which is very close to asking for a definition.)

[kangbear50]

Why do you think?

(This is just a little reminder that you are supposed to show some work of your own on this forum, even for a question such as this, which is very close to asking for a definition.)

I had a thought before, the purpose of using the same pipette and glassware is to ensure the contamination will not change and affect the reaction. That's my understanding so far.

[Borek]

No matter how good the glassware is, it is never perfect, and every pipette/volumetric flask pair has its own volume ratio. Finding this ratio should be a part of the glass calibration procedure (http://www.titrations.info/volumetric-glass-calibration). For example for the A class 20 mL pipette and the A class 100 mL volumetric flask volume ratio is something between 0.2004 and 0.1995, so the difference between final results for two given pairs of pipette/flask can be up to 0.5%.