Which of the following rinses is least likely to affect the accuracy of the results?
A - VCE - SSCE Chemistry - Question 18 - 2018 - Paper 1
Question 18
Which of the following rinses is least likely to affect the accuracy of the results?
A. burrette distilled water
B. burrette rhubarb extract
C. pipette KMnO₄(aq)... show full transcript
Worked Solution & Example Answer:Which of the following rinses is least likely to affect the accuracy of the results?
A - VCE - SSCE Chemistry - Question 18 - 2018 - Paper 1
Step 1
A. burrette distilled water
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Answer
Rinsing a burette with distilled water is a common practice that minimizes contamination. Distilled water is pure and does not introduce any reactive substances that could alter the accuracy of the measurements.
Step 2
B. burrette rhubarb extract
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Answer
Rinsing with rhubarb extract may introduce organic compounds and color, which could interfere with subsequent analyses.
Step 3
C. pipette KMnO₄(aq)
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Answer
Rinsing with a solution like KMnO₄ could lead to chemical reactions or residues affecting future measurements.
Step 4
D. conical flask distilled water
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Answer
Using distilled water to rinse the conical flask is also acceptable; however, it does not eliminate concerns about previous residues as effectively as rinsing the burette with distilled water does.
