EXPERIMENT 3

DENSITY DETERMINATIONS

EXPERIMENT 3

• DENSITY OF A REGULAR SHAPE SOLID• DENSITY OF AN IRREGULAR SHAPE

SOLID• DENSITY OF WATER• DENSITY OF AN UNKNOWN LIQUID• BASED ON DENSITY, IDENTIFY THE

REGULAR AND IRREGULAR SOLIDS AND THE UNKNOWN LIQUID

EXPERIMENTAL

d = m/V

MEASURE m AND V

THEORETICAL

HANDBOOK AND APPENDIX H

REGULAR SHAPED SOLID• ONE OF THE FOLLOWING CYLINDERS:

ZINC (Zn) TIN (Sn)

LEAD (Pb) COPPER (Cu)

ALUMINUM (Al)

• VOLUME OF A CYLINDER:

V = r2 L = (d/2)2 L

• SELECT ONE, RECORD LETTER ON END, DETERMINE ITS DENSITY AND IDENTIFY THE METAL

IRREGULAR SHAPED SOLID

• ONE OF THE FOLLOWING METALS:– COPPER (Cu)– LEAD (Pb)– ALUMINUM (Al)

• USE 100 ml GRADUATED CYLINDER

• SELECT ONE, RECORD ITS LETTER, DETERMINE ITS DENSITY, IDENTIFY METAL BASED ON DENSITY

DENSITY OF WATER

• USE 25 ml GRADUATED CYLINDER• DETERMINE MASS OF DRY & CLEAN

GRADUATED CYLINDER• FILL TO A LEVEL BETWEEN 20 AND 25 ml

WITH DISTILLED WATER (RECORD EXACT LEVEL)

• DETERMINE MASS OF GRADUATED CYLINDER AND WATER

• DETERMINE DENSITY OF WATER

DENSITY OF UNKNOWN LIQUID

• DETERMINE DENSITY USING SAME PROCEDURE AS FOR DISTILLED WATER

• UNKNOWN IS ONE OF THE FOLLOWING:–HEXANE 0.660 g / mL–METHANOL 0.791 g / mL– ETHYL ACETATE 0.900 g / mL

• BASED ON DENSITY, IDENTIFY LIQUID

HOW TO READ A CALIPER?

THEORETICAL DENSITY

ORDER OF EXPERIMENTS

• RETURN CALIPERS & METAL CYLINDERS TO REAGENT BENCH

• RETURN METAL PELLETS TO

APPROPRIATE WASTE BEAKER

• UNKNOWN LIQUID CAN GO DOWN THE DRAIN

EXPERIMENT 3

QUESTIONS?

IT IS TIME TO GO TO WORK!