Chem 008 Lab 1 and 2

Chem 008 Lab 1 and 2 - on of Solids Or ganic Chemistr y Sec...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: on of Solids Or ganic Chemistr y Sec Gupta, 2 Pu rpose and Overview : The main goal of this laboratory experiment is to purify both the vanillin and unknown compound, using recrystallization; a procedure which is commonly used for the separation and purification of solids. In order to determine whether the purification process was a success, melting points of the recrystallized vanillin and the unknown were measured, and through this process of collecting melting points it was easier to determine the identity of the unknown. Chemical Table : Solvents Formul a Boili ng Point ( o C) Meltin g Point ( o C) Densi ty (g/ mL) H 2 O Solubil ity (%) Relati ve Polari ty LD 50 (oral rat) (g/kg ) Flas h Poin t ( o C) Cyclohexane C 6 H 12 80.7 6.6 0.774 <0.1 0.006 13-20 Hexane C 6 H 14 69-95 0.655 0.014 0.009 29-23 Toluene C 7 H 8 110.6-93 0.867 0.05 0.099 5 4 Ethyl acetate C 4 H 8 O 2 77-83.6 0.894 8.7 0.228 11-4 2-Butanone C 4 H 8 O 79.6-86.3 0.805 25.6 0.327 2.7-7 Ethanol C 2 H 6 O 78.5-114.1 0.789 M 0.654 7.1 13 Methanol CH 4 O 64.6-98 0.791 M 0.762 5.6 12 Water H 2 O 100.0 0.0 0.998 M 1.000---- Triphenylmetha ne C 19 H 16 359 94 1.014 insolubl e---- 100 Acenaphthene C 10 H(CH 2 ) 2 277.5 93.6 1.02 insolubl e------ Phenanthrene C 14 H 10 336 101.6 1.063 insolubl------ Gupta, 3 e Data and Calculations : Crude Mass of Vanillin: 2.069g Mass of Plastic Beaker (used for vanillin): 5.288g Crude Mass of Unknown (A-16): 2.168g Mass of Plastic Beaker (used for A-16): 5.280g Percent Recovery- Vanillin 1. Mass of plastic beaker 5.288g 2. Mass of plastic bleaker plus recrstyallized vanillin 6.734g 3. Mass of recrystallized vanillin 1.446g 4 . Mass of crude vanillin 2.069g 5 . Percent Recovery 69.89% Percent Recovery= (Mass of crystals obtained /crude mass) x 100%= (1.446g / 2.069g) x 100%= 69.89% Percent Recovery- Unknown Compound (A-16) 1. Mass of plastic beaker 5.280g 2. Mass of plastic beaker plus recrystallized unknown 6.458g 3. Mass of recrystallized unknown 1.178g 4. Mass of crude unknown 2.168g 5. Percent Recovery 54.34% Melting Point of Crude Melting Point of Purified Gupta, 4 Name of Compound Initial Mass(g) Final Mass(g) Percent Recovery Compound ( o C) Compound ( o C) Vanillin 2.069 1.446 69.89% 57-68.5 76.5-79 Unknown A-16 2.168 1.178 54.34% 85-93 87-90 Unknown A-16 + Triphenylmetha ne-------- 62-64 Unknown A-16 + Acenaphthene-------- 87.5-91 Unknown A-16 + Phenanthrene-------- 62-65 Observations : During the process of vanillin purification, in laboratory experiment 1, I observed that in the hot bath, the crude vanillin dissolved slowly while stirring it. After about ten minutes, the solution turned completely clear; however, there were still some small chunks of vanillin at the bottom of the Erlenmeyer flask. I used the stir ring rod to stir a little more and the small chunks, too, dissolved instantly. In order for the vanillin to recyrstallize, I placed the heated solution into an ice bath, for approximately five minutes. Next, I vacuum filtered the vanillin solution and washed it with water. The crystals that formed from this Gupta, 5...
View Full Document

Page1 / 12

Chem 008 Lab 1 and 2 - on of Solids Or ganic Chemistr y Sec...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online