Laboratory Preparation & Procedure

Materials:

• 50 mL beaker
• 250 mL beaker
• 10- mL graduated cylinder
• 25-mL graduated cylinder
• 50-mL graduated cylinder
• 100-mL graduated cylinder
• 125 mL Erlenmeyer flask
• Funnel
• Analytical balance
• Water

Safety:

Be aware of your surroundings, so you do not break the glassware you are using.

Procedure:

Part A – Volume Measurements

1. Inspect each graduated cylinder – the 10-mL, 25-mL, 50-mL, and 100-mL. Record the scale increments of each graduated cylinder in your data page. Be sure to keep these scale increments in mind as you record volumes of liquids throughout this lab.
2. Using a 50-mL beaker, measure 10 – mL of water.
3. Place a clean, dry funnel into a 10-mL graduated cylinder and carefully pour the water into a 10 – mL graduated cylinder. Record the volume to the correct precision of the device. Do not record beyond the top marking on the graduated cylinder. If it overfills, measure the total volume in portions.
4. Pour the water from step 3 into a 25 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
5. Pour the water from step 4 into a 50 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
6. Pour the water from step 5 into a 100 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
7. Using a 50-mL beaker, measure 40 – mL of water.
8. Pour the water from step 7 into a 100 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
9. Pour the water from step 8 into a 50 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
10. Pour the water from step 9 into a 25 – mL graduated cylinder in portions using a funnel. Be sure to measure the total volume. Record the volume to the correct precision of the device.
11. Using a 250-mL beaker, measure 100 – mL of water.
12. Pour the water from step 11 into a 100 – mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
13. Pour the water from step 12 into a 50 – mL graduated cylinder in portions using a funnel. Be sure to measure the total volume. Record the volume to the correct precision of the device.
14. Using a 125-mL Erlenmeyer flask, measure 50-mL of water using a funnel.
15. Pour the water from step 14 into a 50-mL graduated cylinder using a funnel. Record the volume to the correct precision of the device.
16. Pour the water from step 15 into a 25-mL graduated cylinder in portions using a funnel. Be sure to measure the total volume. Record the volume to the correct precision of the device.

Part B – Mass Measurements

1. Zero the analytical balance.
2. Place a 50-mL beaker (completely dry) on the analytical balance ensuring all doors are closed & allow the digital readout to stabilize.
3.  Record the mass of the 50-mL beaker in your data table.
4. Repeat steps 1 – 3 of the same 50-mL beaker until you have a total of five seperate mass measurements. Be sure to zero your balance between each mass measurement.
5. Calculate the average value of your mass measurements. Record your average value on the board for class use. Show all work for your calculation in your lab notebook.
6. Calculate the standard deviation of your five mass measurements. Show all work for your standard deviation calculation in your lab notebook.
7. Record all values corresponding to the class data set in your lab notebook.
8. Calculate the average of the class data set, showing all work for your calculation.
9. Calculate the standard deviation of the class data set, showing all work for your calculation.