Empirical Formula Lab

1
Empirical Formula Lab

• Day 1 Start data

2
Prepare Materials

• Clean dry 100-150 mL beaker label with station
  -period
• For example 4th period, station 7 ? 7-4
• 50 mL beaker to get acid
• Zero balance (if necessary)

3
Tare mass beaker

• Mass clean, dry beaker after labeled
• Record using correct of sig figs

4
Zinc Me!

• With beaker on balance
• Add one gram to mass and ask to be zinced!
• Once zinc has been added, remass and record as
  gross mass.

5
Add acid

• Goggle up!
• Use the 50 mL beaker to obtain 20 mL of acid
  following directions for using reagent bottles
• Pour into 100-150 mL beaker
• Carry beaker to fume hood and
  place on class hotplate.

6
Data 1-5 show work

• 1. Gross mass . g
• 2. Tare mass . g
• 3. Net mass (1-2) . g
• 4. moles of zinc sf moles
• 3 g x 1 mole sf moles
• p. table g
• 5. atoms of zinc sf atoms
• 4 moles x ??? atoms sf atoms
• 1 mole

7
Day 2

• Finish data calculations

8
Data

• Labeled beaker will be delivered to your station
• White dry zinc chloride (zinc
  chlorine)
• Mass beaker
• Clean leave at station

9
Calculations

• 7. Dry zinc chloride (6-2) . g
• 8. Mass of chlorine (7-3) . g
• 9. Moles of chlorine sf mols
• 8 g x 1 mole sf moles
• p. table g
• 10. Atoms of chlorine sf atoms
• 9 moles x ??? atoms sf atoms
• 1 mole

10
Calculations

• 11. Ratio (zinc should be smaller amount of
  moles) 9/4 sf
• 12. Ratio (10/5) sf
• 13. Empirical Formula
• ZnCl?
• 11 12 andnearest whole ?

11
Finishing Touches

• Double check sig figs units
• Make sure work is shown
• Lab station and partners names