LAB
OVERVIEW
HOW TO READ A
GRADUATED CYLINDER?
mL
We report a measurement by recording
ALL the certain digits + ONE uncertain digit
Significant Figures
(except leading zeros. more details in a minute.)
10-mL graduated cylinder: 2 decimal
places;
25-mL graduated cylinder: 2 decimal
places;
100-mL graduated cylinder: 1 decimal
place.
PURPOSE
DETERMINE THE ACCURACY
OF 4 VOLUMETRIC TOOLS
BEAKER
GRADUATED CYLINDER
PIPET
BURET
PERCENT ERROR
EXP  THE
 100 %
% ERROR =
THE
WHERE:
EXP = EXPERIMENTAL VALUE
THE = THEORETICAL VALUE
HOW TO FIND
EXPERIMENTAL VALUES?
BEAKER: 25 mL
GRADUATED CYLINDER: 25.00 mL
PIPET: 25.00 mL
BURET: 2x.xx mL
HOW TO FIND
THEORETICAL VALUES ?
• V = m/d
• d ─ MEASURE WATER
TEMPERATURE, THEN READ FROM
APPENDIX H.
• m ─ MEASURE FROM A BALANCE.
USE A BEAKER (EXCEPT
GRADUATED CYLINDER) TO CARRY
YOUR WATER SAMPLE TO THE
BALANCE.
BALANCE TIPS
•
•
•
•
USE THE SAME BALANCE
SOLID OBJECTS ONLY ON BALANCE PAN
USE CONTAINER FOR LIQUIDS/POWDERS
POUR LIQUIDS & POWDERS AWAY FROM
BALANCE
• ZERO BALANCE (ZERO OR 0/T BUTTON)
BEFORE EACH MEASUREMENT
EXPERIMENT #2
• ORDER OF MEASUREMENTS
• CLEAN YOUR BENCH AREA AND
ASK FOR INSPECTION BEFORE
LEAVING. SQUEEZE BOTTLE AND
PAPER TOWEL.
EXPERIMENT #2
QUESTIONS?