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OCR A PAG 6.3

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The document consists of analysis and results for OCR A PAG 6.3 with references.

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A2 Unit F326 - Practical Skills in Chemistry








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OCR
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Chemistry A
Unit
A2 Unit F326 - Practical Skills in Chemistry
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August 30, 2023
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  • pag 63
  • practical assessment group

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PAG 6.3: Preparation of benzoic acid

Analysis

1) a) Balanced symbol equation is:
C6H5COOCH3 +NaOH -> CH6H5COONa + CH3OH
Methyl benzoate (C6H5COOCH3) and sodium hydroxide (NaOH) are in a 1:1
ratio in the balanced symbol equation and 0.03 moles of NaOH reacted 1.25
X 10^-3 mol of methyl benzoate. 0.03 is greater than 1.25 X 10^-3 so NaOH
was in excess in the alkaline hydrolysis of methyl benzoate.
b) percentage yield =

2)


Obtained Melting Point (°C) Expected Melting Point (°C)


Recrystallised Benzoic Acid 101-111 121-127

Crude Benzoic Acid 117-122 118-122



Expected recrystallised benzoic acid melting point

Expected crude benzoic acid melting point

DePaul University. (September 2002). Recrystallization and Melting Points.
[online] Last accessed 29th December 2022:
https://condor.depaul.edu/mdintzne/171-02*sample%20lab.pdf
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