Today in History- January 1.

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On January 1, 1863 the Emancipation Proclamation was issued by Abraham Lincoln to free all Confederate slaves. Find out more here.
 

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Recrystallization of Sulfanilamide & Fluorene- Post Lab 4

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Observations: The fluorene completely dissolve the toluene almost instantly. String like crystals appears on the solution when it was cooling. The pure sulfanilamide appears yellow when wet however, after it was dry returns to a white color Data: Weight of Impure Sulfanilamide: 0.80 grams Weight of Flask: 57.02 grams Weight of Flask + Pure Sulfanilamide: 57.82 grams Weight of Pure Sulfanilamide: 0.70 grams Pure Sulfanilamide: 155-160 degrees Celsius Percent Recovery: 0.70/0.80 x 100%= 87.6% Weight of Impure Fluorene: 0.78 grams Weight of Flask: 30.15 grams Weight of Flask + Pure Fluorene: 30.96 grams Weight of Pure Fluorene: 0.57 grams Melting Point: pure Fluorene: 114-118 degrees Celsius Percent Recovery: .57/.88 x 100%= 73% Post-lab Question:   Which solvent did you determine was best for the recrystallization of fluorene? Methyl alcohol, water and toluene were the three solvents tested.   Methyl was the best for rec...
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Art is used as a way to express human’s creativity. Ancient Greece art paved the way for the Classical, Archaic and Hellenistic art. Art is very important to the Greeks, Greece have been making art from the earliest time until now. The Archaic period was at time between 700-400 BCE where abundant of Kouros (youth) sculpture were made. They were used as grave markings or sometimes representation of a god. These sculpture were mostly stick figures with no movement made of bronze. After the archaic period, it was the classical period. Classical art represents the perfection of the human body. Many art sculpture represent at transitional art with features that are unique to two different time periods. The Kritios boy is from the late archaic and early classical. It is a standing sculpture of a nude man at 2’10’’ tall from 480 BCE. This represent a transition from the archaic to classical period. You can see that the artist understand the musculature of the boy. Where the abdominal muscl...
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Preparation of Dibromosuccinic Acid- Post Lab 9

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Observations 1.       Within 5 minutes the color of the solution starts to become colorless. 2.       We added around .5ml of the bromine stock solution to the solution while it was on the water bath. 3.       The product of this experiment was in the vacuum filter for 20 minutes. Data Fumaric acid: 0.19 Bromine: 2.7 ml Final weight of Fumaric acid: .59g Theoretical yield: 0.0028 mol x 275.88 g/mol = 0.77g Percentage yield: .59g/0.77g x 100%= 76% Melting point 250-255 ◦C Question Which stereoisomer of dibromosuccinic acid (racemic melting point = 170 o C, meso melting point = 290 o C) did you obtain? The stereoisomer of dibromosuccinic is Meso. The melting point of our experiment product is between 250-255 ◦C. It is not exact meso melting point however, it is closer to meso than racemic melting point.
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