1. Chemistry Lab #3 2C – One in a Million Lab Book Page 28 MasterBlaster info: Set up – page 298 Measuring Absorption - 300

2. Lab 3 - One in a Million Read in the lab book: Master Blaster Set up – page 298 Measuring Absorption – 300 Draw out tables 1 and 2 on pages 29 and 30 – use rulers to make it neat!

3. Job Assignments A cleanup B cleanup/scientist C reader D aprons/scientist All record Periods 1245, do not unplug master blasters. Period 6, unplug and wrap cords with velcro

4. A lab hand out is provided. Page 1 VI. Draw out tables 1 and 2 on pages 29 and 30 – use rulers to make it neat!

5. Page 298, & 300(absorption) See above pages in your Lab Book for Master Blaster (Lab Master) use. We’ll be using the Spectrophotometer to “read” the amount of light that is absorbed by the color present in the solutions. Complete Part 1 (page 28) and Part 3 (page 30) after reading the above pages.

6. Sample Plot Soln. RGB 10.99 3.75 3.76 20.16 2.60 2.55 30.03 0.81 1.02 40.00 0.03 0.15

7. VIII Calculations Conc = volume of substance x 100 total volume Soln #1: 1ml food color x 100 = 10% 10 mL solution Soln #2: 1mL Soln #1 x 10 = 1.0% 10 mL solution Soln #3: 1mL Soln #2 x 1.0 = 0.10% 10 mL solution

8. Parts Per Million (PPM) Concentration in PPM = Conc. X 1,000,000 SO: (convert %ages to decimals) PPM = 0.10 x 1,000,000 = 100,000 ppm With prior calculations, complete the tables before you hand in your reports.

10. Actual Write up – Due: One cover sheet per group. Staple your pages together.: Page 1 – IV Data - completed data tables Page 2 VII. Graphs (graph your data on copies I have for you – don’t write in the book & I have RGB markers for you) VIII. Calculations – DO NOT do calculations until you have collected all data!!! See page 29 for calcs. Last Page IX. Discussion – Answer Parts 4 & 5 here. X. Conclusion Paper clip all reports together behind cover sheet.