Here’s the shared data from CHM 110 Experiment 3B. These are the ratios of mass product / mass barium chloride dihydrate that you need to complete the table on page 74 and answer the questions on pages 75 and 76 (10th edition: pages 72, then 73 and 74.) This is data for the Thursday lab section (section 3)!

Ratio of (mass product / mass BaCl₂.2H₂O):

• 0.85080
• 0.84979
• 0.84963
• 0.85048
• 0.84631

The write-up for Experiment 3B (pages 71-76 in 9th edition, pages 69-74 in 10th edition) ) is due at our next lab meeting. If you have any questions about either the calculations or the rest of the write-up, either come by my office or ask here in comments.

Here’s a handout that describes the calculation procedure for this experiment:  (It’s the same one that was on your desk when you came in to the lab.)

[CHM 110 Experiment 3B calculation notes]

I recommend that you use your TI-83 calculator or a spreadsheet to find the standard deviation the lab manual asks you to calculate.

Warning:  There’s a possibly confusing typo on page 74 of the 10th edition lab manual.  In the chart in the middle of the page, barium chloride monohydrate is incorrectly given the formula BaCl₂.H₂O₄. The correct formula is BaCl₂.H₂O

CHM 110, all sections.  I have updated the gradebook in D2L with your most recent test, as well as our recent labs and homework grades.  Your current course average is also available.

Remember that at the end of the term, both one homework grade and one lab report grade will be dropped.  Also, your lowest test grade will be replaced by the final exam grade if it helps your average – unless you miss a test.  If you miss a test, the missed test will be replaced by the final exam grade.