CHEM 2204

Chemical Laboratory Techniques

Browsing Posts in Past Labs

Read the following:

  1. T & P 2 – Rotary Evaporator, Precipitation, Gravity Filtration, Graphing
  2. Demonstrations of Nine Practical Lab Techniques – Techniques 6 and 9

We will be working on Techniques 6 and 9. Read through the lab carefully before coming to the lab.

If your determination of the mass of the sand in the vial was +/- 0.006 g ( +/- 0.2%), good job, you did well. Most of you noticed that there were fine sand particles adhering to the side of the vial. In order to determine the mass of the sand accurately, here are the steps to consider.

1. Weigh vial with the sand on the balance.
2. Empty the sand into another container.
3. Rinse the vial with water thoroughly.
4. Dry the vial thoroughly.
5. Reweigh the empty vial.
6. Subtract the mass from step 5 from step 1 to get the mass of the sand.

It is not always necessary to transfer the sand into a weigh boat in order to determine its mass. Leaving the sand in the vial will eliminate the loss of sand during the transfer.

Now that you know how to weigh properly, you need to apply the techniques learned for next week’s lab because next week is all about weighing.

It is very important that you come to this Friday’s lab well-prepared.

  • Come to the lab on time
  • Have your lab coat, goggles, lab manual and the datasheets, pen, and calculator
  • Prepare and have read Lab 1 – Moisture and Ashing

If you fail to bring any of the above items you will not be allowed to do the lab!

Go to the link below

http://nobel.scas.bcit.ca/courses/wpmu/chem2204/laboratory-2/

and download the Friday AM and Friday PM schedules for Lab 1 – Moisture and Ashing. Check the equipment photos as well. We will be following the schedule very closely in order to maximum the drying time of the sawdust samples and the ashing time of our coal samples.

Read the following:

  1. T & P 1 – Weighing, Bottle-Top Dispenser, and Graphing
  2. Demonstrations of Nine Practical Lab Techniques – Techniques 4 and 5

We will be working on Techniques 4 and 5. Read through the lab carefully before coming to the lab.