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. Record the beaker’s reading.
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. 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. Record the beaker’s reading.
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. Record the beaker’s reading.
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. Record the flask’s reading.
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.  Determine and record the mass of the 50-mL beaker. Be sure the beaker is completely dry.
3. Repeat the process of determining the mass of the 50-mL beaker until you have a total of five mass measurements. Be sure to zero your balance between each mass measurement.
4. Calculate the average & standard deviation of your mass measurements. Record your average value on the board for class use.
5. Record the class data set in your lab notebook and determine the average of the class data set.