slips of the mixture or the mixture was not allowed to boil for enough time to

# Slips of the mixture or the mixture was not allowed

• Lab Report
• 7

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slips of the mixture or the mixture was not allowed to boil for enough time to get rid of all the water. Conclusion In part A, benzoic acid was recovered using drying agents 0.048 g and had a dissociation constant of 0.0007203. In part B, unknown # 36 was separated into a phenol, carboxylic acid and a neutral compound. The neutral compound was not identified because not enough was recovered for the melting point test, but the phenol was identified as β-naphthol and the carboxylic acid was m -bromobenzoic acid. The percent recovery for unknown #36 was calculated to be 20.6% Post Lab Questions: 1. 5.80=(xml/2.0ml)/(75.0-x)/3.0 5.8.0=3.0x/(2.0*(75.0-x) 11.6(7.5-x)=3x x=59.6 mg in MtBE 2. Extracting with 20mL of MtBE: 5.80=(xmL/ 20mL)/(( 10-x)/100mL) x= 5.37 mg of traumatic acid First time extracting with 10mL of MtBE: 5.80=(xmL/ 10mL)/(( 10-x)/100mL)

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x= 3.67mg Second time extracting w/ 10mL of MtBE: 5.80=(xmL/ (10mL))/(( 10-3.67mg-x)/100mL) x= 2.32 mg Total extraction 3.67mg+ 2.32mg= 5.99mg Since 5.99 mg is more than 5.37mg, it is clear that extracting twice with 10mL each is more effective than extracting once with 20mL of MtBE. 3. A. NaC 7 H 4 O 2 Cl+ HCl→ NaCl + C 7 H 5 5O 2 C B. NaC 7 H 7 O + HCl → NaCl + C 7 H 8 O C. C 6 H 16 N + NaOH → H 2 O + NaC 6 H 15 N 4. No, do not proceed with the drying agent. Drying agents do not have the capacity to absorb a lot of water, they can just absorb trace amounts of water and moisture. In this case, it would be wise to separate the organic layer and aqueous layer again using a pipet to get rid of as much water as possible. 5. a. In order to separate an organic base mixed with an organic neutral compound, start by dissolving the mixture in MtBE. Treat this solution with HCl and remove the aqueous layer using a pipet. Transfer this aqueous layer into a separate tube and repeat the process two more times. Combine the three aqueous layers and use
• Fall '13
• JeramyBaum

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