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Chem 220 Practical 5, Assignments of Chemistry

University of KwaZulu-NatalChemistry

This is the laboratory practical answers already done for you.

Typology: Assignments

2023/2024

Available from 05/01/2024

nonjabulo-ngubane
nonjabulo-ngubane 🇿🇦

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NONJABULO NGUBANE
223037959
CHEM 220
PRAC 5 (FRIDAY I6)
Title: The synthesis of Benzilic Acid from Benzil
Aim: To prepare Benzilic Acid from Benzil using green approach
Reagents and Chemicals:
Benzil
Ethanol
KOH
H2O
Dilute H2SO4
Modification to experimental procedure: No modifications were made.
Reaction Mechanism:
pf2

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NONJABULO NGUBANE

CHEM 220

PRAC 5 (FRIDAY I6)

Title: The synthesis of Benzilic Acid from Benzil Aim: To prepare Benzilic Acid from Benzil using green approach Reagents and Chemicals: Benzil Ethanol KOH H2O Dilute H2SO Modification to experimental procedure: No modifications were made. Reaction Mechanism:

mp of substance prepared from the literature : 150 to 152 ℃ (The Journal of Organic

Chemistry,29,p.1631, 1964 DOI: 10.10121/jo01029a509)

mp of substrate prepared : 147 ℃

Expected yield: 76% (Herman van Bekkum, Herman W. Kouwenhoven, in Studies in Surface Science and Catalysis, 2007) Calculation of yield: Expected mass=

mass benzil

molar mass benzil

X molar mass of benzil acid

5 g

210,23 g / mol

X 228, 247 g/mol =5,429g % yield =

actual mass

expected mass

X 100

X 100

Discussion:

-The melting point of the substrate was 147 ℃ which was very close to the literature melting point

150-152 ℃ , this indicate how pure our sample was.

  • The % yield we got was 72,37% which was close to the expected % yield which was 76%, this also indicate that they were no so many impurities and how much I was delicate with my product that I did not leave a lot behind when I was filtering or recrystallizing. -The reaction did turn dark purple as expected when I was heating it for 15 min after adding KOH, which indicate how expensive our substrate might have been.