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A student titrated 25 mL aliquots of three different concentrations of an organic acid against a standardised potassium hydroxide, KOH, solution - VCE - SSCE Chemistry - Question 23 - 2021 - Paper 1
Question 23
A student titrated 25 mL aliquots of three different concentrations of an organic acid against a standardised potassium hydroxide, KOH, solution. The student's resul... show full transcript
Worked Solution & Example Answer:A student titrated 25 mL aliquots of three different concentrations of an organic acid against a standardised potassium hydroxide, KOH, solution - VCE - SSCE Chemistry - Question 23 - 2021 - Paper 1
Step 1
Which one of the following statements is consistent with the results shown in the table?
Answer
To determine which statement is consistent with the results provided, we can analyze the average KOH titres for each sample:
- Sample 1 (Average Titre: 20.37 mL): This is neither the highest nor the lowest.
- Sample 2 (Average Titre: 19.98 mL): This shows a lower average compared to Sample 1 and Sample 3, indicating it is less concentrated.
- Sample 3 (Average Titre: 21.55 mL): This has the highest average titre, suggesting it is the most concentrated acid.
Based on this analysis:
- Option A (Sample 2 is the most concentrated acid) is incorrect because Sample 2 has the lowest average.
- Option B (Sample 3 is the most concentrated acid) is consistent with the findings as it has the highest average titre.
- Option C (There is not enough information to draw a valid conclusion) is incorrect; we have sufficient data to conclude.
- Option D (The averages are correct as the results are concordant) cannot be precisely validated without additional context on the consistency of titrations.
Thus, the correct answer is B: Sample 3 is the most concentrated acid.