Chemistry Lab #3

2C – One in a MillionLab Book Page 28

MasterBlaster info:Set up – page 298

Measuring Absorption - 300

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!

Job AssignmentsA cleanup

B cleanup/scientistC reader

D aprons/scientistAll record

Periods 1245, do not unplug master blasters.

Period 6, unplug and wrap cords with velcro

A lab hand out is provided.

Page 1VI. Draw out tables 1 and 2 on pages 29 and 30 – use rulers to make it neat!

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.

Sample Plot

Soln. R G B1 0.99 3.75 3.762 0.16 2.60 2.553 0.03 0.81 1.024 0.00 0.03 0.15

VIII Calculations

Conc = volume of substance x 100 total volumeSoln #1: 1ml food color x 100 = 10% 10 mL solutionSoln #2: 1mL Soln #1 x 10 = 1.0% 10 mL solutionSoln #3: 1mL Soln #2 x 1.0 = 0.10% 10 mL solution

Parts Per Million (PPM)

Concentration in PPM = Conc. X 1,000,000SO: (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.

Actual Write up – Due: One cover sheet per group.

Staple your pages together.:Page 1 – IV Data - completed data tablesPage 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 PageIX. Discussion – Answer Parts 4 & 5 here.X. Conclusion

Paper clip all reports together behind cover sheet.