1. Applying Green Chemistry to Purification
Honors Chemistry Lab

2. Pre Lab Guiding Questions/Simulations
Part 1: the 12 Principles of Green Chemistry
Nothing should be left over!
Review Website
Answer Questions
Part 2: Percent yield

3. Key Points: Some chemists harvest materials from nature
Separate substances in them
Make new substances from them
Pure substances have unique properties that can be used in distinguishing among them
They consider the benefits and risks of different options when deciding which is the best chemical process to use

4. Relating the Information to This Lab:
Apply the differences in chemical reactivity upon heating for each substance in the mixture
Na2CO3 and NaHCO3
Evaluate the efficiency of the process
Financial cost or detriment to the environment
Percent Yield
Environmental health
Minimize wastes and biproducts
Atom Economy: Ratio of the theoretical yield of desired product compared to total theoretical yield of all products
D/T * 100%
The lower the atom economy, the less efficient the process is because more wastes are produced in the process

5. Procedure Development:
How will you determine the relative amounts of Na2CO3 and NaHCO3 in the mixture?
Use the 12 principles of green chemistry and stoichiometry
Materials: Refer to lab packet
Procedure guidelines:
Use 4 to 5 g of mixture
How many times will you heat-cool-weigh?
How long will you heat the mixture each time?
How to heat a crucible
Safety Concerns

6. What Data Will You Collect?
Data tables prepared
Observations

7. What Will You Calculate?
Masses of each component of the mixture
Percent composition of the mixture

8. Lab Report Requirements
ALL parts of the lab report
Reaction!!!
Discussion Information
Focus on the science behind the reaction that occurred
Define terms, use the lab for examples
Only one paragraph on how this lab relates to green chemistry
Most of the discussion will be like the last one you wrote
Lab is due ___________

9. Lab Report Review In Class
Review data from “other students” and analyze for greenness of the procedure
Counts as a quiz grade
No lab quiz for this lab