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Two possible sources of error in this analysis are I – the precipitate of calcium oxalate is not rinsed with water after being filtered - VCE - SSCE Chemistry - Question 9 - 2005 - Paper 1
Question 9
Two possible sources of error in this analysis are I – the precipitate of calcium oxalate is not rinsed with water after being filtered. II – the calcium oxide is no... show full transcript
Worked Solution & Example Answer:Two possible sources of error in this analysis are I – 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.
Answer
If the calcium oxalate precipitate is not rinsed, impurities may remain on the precipitate. This can lead to an increase in mass, affecting the overall analysis and potentially resulting in a higher measurement of the calcium content.
Step 2
II – the calcium oxide is not heated to constant mass.
Answer
If the calcium oxide is not heated to constant mass, any unreacted material may still be present. This means that the final mass recorded would also be higher than the actual mass of the calcium oxide, leading to an inflated calculation of results.
Step 3