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Investigation 7: Green Chemistry - Separating a Mixture

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by

Mrs. Collins

on 18 September 2013

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Transcript of Investigation 7: Green Chemistry - Separating a Mixture

Results
Investigation 7: Green Chemistry - Atom Economy
Atom Economy
Similar to a percent yield.
If the atom economy is closer to 100%, then the amount of desired product is maximized.
Procedure
You will be provided with a mixture of unknown proportion of NaHCO3 and Na2CO3.
Write a series of steps to determine the relative amounts of each - do at least three trials, changing one variable from one trial to the next.
Sodium bicarbonate decomposes when heated:
2NaHCO3 (s) --> Na2CO3 (s) + H2O (g) + CO2 (g)
Chemical Hygiene/Safety/Waste
NaHCO3 - slightly hazardous in case of skin contact (irritant), eye contact (irritant) of ingestion and of inhalation.
Na2CO3 - hazardous in case of skin contact (irritant), eye contact (irritant) of ingestion and of inhalation.
Safety: wear goggles, practice good lab behavior.
Waste: put all waste in the waste container.
Phase 2
Goal
Design an experiment to determine the relative amounts of NaHCO3 and Na2CO3 in a mixture of the two substances and evaluate your process using the Green Chemistry Principle of atom economy.
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