applying green chemistry to purification honors chemistry lab
TRANSCRIPT
Applying Green Chemistry to PurificationHonors Chemistry Lab
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 Review Website Answer Questions
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
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
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
What Data Will You Collect? Data tables prepared Observations
What Will You Calculate? Masses of each component of the
mixture Percent composition of the mixture
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 ___________
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