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13 Dec 2019

For each of the following pairings, citcle the compound expectedto have the higher Rf value in a silica gel TLC analysis:

a) benzoic acid and naphthalene

b) 1,4-dimethoxybenzene and 4-chlorobenzoic acid

c) naphthalene and 4-chlorobenzoic acid

d) 1,4 - dimethoxybenzene and benzoic acid

e) 2-chloro-4-nitroaniline and naphthalene

f) napthalene and 4-chloroaniline

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Beverley SmithLv2

17 Dec 2019

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Organic Chemistry Lab: Base Extraction

1. If you had a mixture that contained benzoic acid, 2-naphthol and napthalene how would the process of separating these three compounds differ from separating benzoic acid and naphthalene?

2. Compare the solvents used for extraction to a mixed solvent for recrystallization.

a. Why would extraction not work if two miscible solvents were used?

b. Why would crystallization not work if two immiscible solvents were used?

3. Compare and contrast the separation and purification of benzoic acid from:

a. Malonic acid

b. 1,4-dichlorobenzene.

4. What would happen if 0.5 M HCl was used to neutralize a NaOH solution containing benzoate ions? Consider the following when answering:

a. Total Volume

b. pH

c. solubility of benzoate; solubility of benzoic acid

5. What would happen if the pH of an aqueous solution contaning benzoic acid was at 4.0 and not at 2.0?

These questions were already posted on this site twice, but both people answered them incorrectly. They are not asking for diagrams, they are asking for explanations. Thank you for your time!

Organic Chemistry Lab: Base Extraction 1. If you had a mixture that contained benzoic acid, 2-naphthol and napthalene how would the process of separating these three compounds differ from separating benzoic acid and naphthalene? 2. Compare the solvents used for extraction to a mixed solvent for recrystallization. a. Why would extraction not work if two miscible solvents were used? b. Why would crystallization not work if two immiscible solvents were used? 3. Compare and contrast the separation and purification of benzoic acid from: a. Malonic acid b. 1,4-dichlorobenzene. 4. What would happen if 0.5 M HCl was used to neutralize a NaOH solution containing benzoate ions? Consider the following when answering: a. Total Volume b. pH c. solubility of benzoate; solubility of benzoic acid 5. What would happen if the pH of an aqueous solution contaning benzoic acid was at 4.0 and not at 2.0?

Calorimerty and enthaply oof combution lab.

Attention: I need help with math cad. Please dont answer it anyother form. If you need the mathcad software email me. khan 11 27 94 @ g m a i l dot com. i will compansate you.

LAB DATA:

Benzoic acid #1

Temp: Temp inital =21.2 deg temp final 23.6

Mass: .9961 Grams.

Wire: 9.3 cm..... all wire were used.

Benzoic acid #2

Temp: Temp initial=22.1 Temp final 24.7

mass: 1.0137grams

wire: 9.3 cm....... .8cm left

Napthalene #1

Temp: Temp initial=21.8c...Temp final=25.6c

Mass: .98grams

Wire: 9.3cm inital 1.0cm left

Napthalene#2

T1= 21.9 T2=28.8

Mass=1.0777g

wire:9.3 to .5cm

1.. Determine the calorimeter heat capacity using the known enthalpy of combustion of benzoic acid and from the equation below . 2. Calculate ÎHc for naphthalene using equations