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Unformatted text preview: Green Chemistry: Assignment (100 pts)
Question of the Day: What makes on experiment "green?"
This assignment report is to be typed using 10 or 11 font size.
Calculations & chemical reactions can be hand written, but must be legible-
1 (30 pts) Given the below are two procedures for the synthesis of creatiner
a. (18 pts) Identify and Ist three differences between the two experimental procedures,
b. (12 pts] For each of the three differences identified, determine whether or not a green
principle was applied, If a green principle was used please indicate what the principle is
by its number as it is listed in "Green Chemistry Principles" handout
Procedure 4: Cthanal
To o solution of sarcosine (0 89 g, or 1 equivalent) in ethanol (5 mL) was added solid sodium
chloride (0258 g or 1 equivalent). In another flask containing a solution of cyanamide (0.84 g or 2
equivalents) in distilled water (2 mi) was added concentrated (28%% (w/v)) ammonium hydroxide
(2 mLJ. The two solutions were combined into a reaction vessel and stirred for 1 hour at 50"C.
The product formed was then isolated by vacuum filtration with the waste (dicyanodiomide in
concentrated ammonia solution) collected in the filtration flask.
To a solution of sarcosine (0.89 g. or 1 equivalent) in distilled water (5 mL) was added a solution
of cyanamide (0.42 g or 1 equivalent) in distilled water (2 ml). A portion of dilute (5% (w/v))
ammonium hydroxide (2 ml) was added to the mixture and then stirred ot room temperature
overnight. The product formed was then isolated by vacuum filtration with the waste (dilute
ammonium solution) collected in the filtration flask.
2. (20 pts) The chemical reaction for preparing creatine from sarocosine and cyanamide is a 1:1
molar ratio. Ammonium hydroxide is the reaction catalysis.
Sarcosine (CsH,NOz) + cyanamide [CH,N2) > creatine (C.H;N302)
Barney ran the above reaction and determined that he had a percent yield of 68.5%.
Determine Barney's actual yield in grams, given that he started with 0.41 grams of
cyanamide and 0.90 grams of sarcosine....
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