Which one of the following would have resulted in a concentration that is higher than the actual concentration?
A - VCE - SSCE Chemistry - Question 24 - 2020 - Paper 1
Question 24
Which one of the following would have resulted in a concentration that is higher than the actual concentration?
A. The pipette was rinsed with NaOH solution.
B. Th... show full transcript
Worked Solution & Example Answer:Which one of the following would have resulted in a concentration that is higher than the actual concentration?
A - VCE - SSCE Chemistry - Question 24 - 2020 - Paper 1
Step 1
A. The pipette was rinsed with NaOH solution.
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Answer
Rinsing the pipette with NaOH solution would lead to an increase in concentration. This is because NaOH is a strong base that may introduce additional hydroxide ions into the solution.
Step 2
B. The pipette was rinsed with C$_3$H$_6$O$_3$ solution.
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Answer
If the pipette was rinsed with C3H6O3 (which could be a neutral or acidic solution like glycerol), it would not increase the concentration of the solution being measured.
Step 3
C. The conical flask was rinsed with NaOH solution.
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Answer
Rinsing the conical flask with NaOH would also contribute additional sodium hydroxide to the solution, potentially yielding a higher concentration.
Step 4
D. The conical flask was rinsed with C$_3$H$_6$O$_3$ solution.
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Answer
Rinsing the conical flask with C3H6O3 would not lead to an increase in concentration, as it would be introducing a neutral or acidic component.
