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Two possible sources of error in this analysis are — the precipitate of calcium oxalate is not rinsed with water after being filtered - VCE - SSCE Chemistry - Question 9 - 2005 - Paper 1

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Two possible sources of error in this analysis are — the precipitate of calcium oxalate is not rinsed with water after being filtered. — the calcium oxide is not hea... show full transcript

Worked Solution & Example Answer:Two possible sources of error in this analysis are — the precipitate of calcium oxalate is not rinsed with water after being filtered - VCE - SSCE Chemistry - Question 9 - 2005 - Paper 1

Step 1

I — the precipitate of calcium oxalate is not rinsed with water after being filtered.

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Answer

If the calcium oxalate precipitate is not rinsed, impurities may remain, which can artificially increase the measured mass. Therefore, this error would likely lead to a higher result in the analysis.

Step 2

II — the calcium oxide is not heated to constant mass.

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Answer

If calcium oxide is not heated to constant mass, it may still contain water or other impurities, which would add to its mass. This would also result in an overly high result in the analysis. Thus, both errors contribute to an inflated result.

Step 3

Conclusion

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Answer

Both errors identified in parts I and II lead to a result that is too high. Therefore, the correct answer is C — both I and II.

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