1.) Why are the sides of the buret tapped after filling it?
2.) Why are few millilters of liquid drained through the tip after filling the the buret?
3.) After delivering a certain volume into a flask, a drop of liquid is hanging from the tip. Is it part of the delivered volume? Should it be added to the flask?
Patulong po rito mga ate/kuya yung matitino lang sana Ayan po 50 points nayan
1. This is a waste of time, as all volumes delivered by a buret are determined from the difference between initial and final readings. ... Close the stopcock, tap the buret sides gently, and allow the liquid to stand for a few minutes to clear gas bubbles dissolved in the liquid.
2.After filling the buret with solution, drain a few milliliters of liquid through the stopcock into a beaker to remove any air bubbles trapped in the valve. ... This step is important because the hanging drop is part of the volume delivered by the buret.
3.When finished, touch off the drop of liquid hanging at the tip into the transferred liquid (it is part of the delivered volume) but do not blow out any liquid remaining inside the tip of the pipet! ... Caution: Never use a pipet to transfer heated solutions or incompletely dissolved solids.
