A student was carrying out a titration to establish the concentration of vitamin C using iodine solution - Scottish Highers Chemistry - Question 20 - 2016
Question 20
A student was carrying out a titration to establish the concentration of vitamin C using iodine solution.
Which of the following would help the student achieve a pre... show full transcript
Worked Solution & Example Answer:A student was carrying out a titration to establish the concentration of vitamin C using iodine solution - Scottish Highers Chemistry - Question 20 - 2016
Step 1
A Placing a white tile underneath the conical flask
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Placing a white tile underneath the conical flask enhances visibility of the color change that occurs at the endpoint of the titration, making it easier to identify when to stop the addition of the iodine solution.
Step 2
B Using the bottom of the meniscus when reading the burette
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Using the bottom of the meniscus for reading the burette is crucial for ensuring accurate measurement of the liquid volume. This provides a more precise determination of how much iodine solution has been added, helping to achieve a more accurate endpoint.
Step 3
C Repeating titrations
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Repeating titrations is a common practice to ensure reliability in results. Performing several titrations and averaging the results allows for the identification of discrepancies and helps to hone in on the precise endpoint.
Step 4
D Carrying out a rough titration first
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Carrying out a rough titration first provides a preliminary idea of the volume needed to reach the endpoint. This guides the student in the more precise titrations that follow, allowing them to make smaller adjustments as they approach the endpoint.
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