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Ethanoic Acid In Vinegar Lab Report

925 Words4 Pages

Misbah Rashid
Candidate Number: 004438-0065
Mrs. Angela Arnold
Chemistry HL
16th November 2014

IB Chemistry Internal Assessment

Determining the Concentration of Ethanoic Acid in Vinegar
DCP and CE

Data Collection and Processing

Raw Data Rough titre First accurate titre Second accurate titre Third accurate titre
Initial burette reading Vi / cm3 (±0.05 cm3) 7.60 6.20 5.60 3.40
Final burette reading Vf/ cm3 (±0.05 cm3) 34.1 32.2 31.9 29.1
Total titre Vacid / cm3 (±0.10 cm3) 26.5 26.0 26.3 25.7
Concentration of NaOH 0.1 mol dm-3
Volume of Vinegar /cm3 (±0.12 cm3) 25 cm3
Phenolphthalein indicator 3 drops

Qualitative data: The pink color of phenolphthalein indicator and sodium hydroxide solution turns colorless when it reaches the end point. …show more content…

Diluted vinegar is titrated against sodium hydroxide solution and the volume of diluted vinegar is obtained through calculation.
Error Analysis
The literature value provided was 5%. The result that was attained from the experiment was (6.006 ± 0.05)%.
Percentage error = ((5-6.006)/5)×100 = 20.12%
The percentage error has a wide difference from the percentage uncertainty acquired from the apparatus, which was 0.908%. Therefore, the result of the experiment does not agree with the literature value and is not suitable.

Evaluation
Weakness/Limitation Why? Suggestion
Sodium hydroxide left in the pipette Few drops of NaOH might have been left in the pipette while transferring it to the conical flask. If some of it remains, there is a systematic error and the expected amount of moles in conical flask is lesser. Hence, the amount of ethanoic acid to neutralize sodium hydroxide is lesser too. Distilled water can be poured in the pipette to swill out the remaining sodium hydroxide. Distilled water will not affect the amount of moles in sodium hydroxide, but it will remove the remaining NaOH in the pipette and transfer all in the conical

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