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## PowerPoint Slideshow about ' Chemistry Lab #3' - uriah-holmes

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### Chemistry Lab #3

### Job Assignments

2C – One in a Million

Lab 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!

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

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!

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.

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

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.

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.

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