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 72 and answer the questions on pages 73 and 74 This is data for the Wednesday lab section (section 2)!
Ratio of (mass product / mass BaCl2.2H2O):
- 0.85016
- 0.85154
- 0.85061
- 0.85369
- 0.84685
A note on the data above: Section 2 folks, this is good data. (In fact, just a bit better than Monday’s results.) So, if you do the calculations correctly, you will correctly identify the solid product!
The write-up for Experiment 3B (pages 71-74) 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]
Pages 3, 4, and 5 of the handout directly apply to the calculations for the writeup. Remember to calculate the numbers for your table based on your actual amount of starting material (the handout’s calculations are based on 2.5 grams of starting material, which is different than the amount you actually used…)
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