they give statements in our books and dont add head or tail to make us understand why. so, i was doing this practical records for my exam and i did not understand why... 1) pipette should "never" be held from the bulb. 2) pipette must "never" be used for drawing strong acid or base. 3) we should never blow out the last drop clinging to the nozzle of the pipette. 4) conical flask should not be rinsed with the solution to be filled in it. 5) base should be taken in the conical flask and acid in the burette (for titrations). 6) volumetric flask should "never" be used for measuring out solutions. its annoying to be compelled to remember statements without understand the "because... " behind it. plz help.