LAB PRACTICE QUIZ ANSWERS
Pressure (mm Hg)
766.54 (20 x .077 + 765)
770.39 (70 x .077 + 765)
777.32 (160 x .077 + 765)
783.48 (240 x .077 + 765)
788.87 (310 x .077 + 765)
795.8 (400 X .077 + 765)
Volume (mL)*see below
507.88 (30 + 477.88)
502.88 (25 + 477.88)
497.88 (20 + 477.88)
492.88 (15 + 477.88)
487.88 (10 + 477.88)
482.88 (5 +477.88)
*where did 477.88 come from?
step 1) pi x radius squared x length of the capillary tube = volume of the capillary tube
3.14 x .0625 x 21= 4.12
step 2) volume of the flask - volume DBP - volume of tube = volume of air in flask
532 - 50 - 4.12 = 477.88
step 3) volume of air in the syringe + volume of air in flask = total volume of air in apparatus
(30 + 477.88), (25 + 477.88), (20+ 477.88)...
