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A titration was performed to determine the concentration of an ethanolic acid, C2H4O2, solution using the following procedure: 1 - VCE - SSCE Chemistry - Question 4 - 2021 - Paper 1
Question 4
A titration was performed to determine the concentration of an ethanolic acid, C2H4O2, solution using the following procedure: 1. 25.00 mL of the C2H4O2 solution wa... show full transcript
Worked Solution & Example Answer:A titration was performed to determine the concentration of an ethanolic acid, C2H4O2, solution using the following procedure: 1 - VCE - SSCE Chemistry - Question 4 - 2021 - Paper 1
Step 1
A. burette tap leaked during one of the titrations.
Answer
If the burette tap leaked, it would lead to inaccurate volumes of NaOH being delivered, directly impacting the titration results. This is a systematic error as it consistently affects the volume delivered, leading to biased conclusions about the concentration of the ethanolic acid.
Step 2
Step 3
C. number of drops of indicator was not consistent for each titration.
Answer
Inconsistent drops of indicator could affect the visibility of the endpoint of the titration, but this is more of a procedural or random error rather than a systematic error. Each titration may show variation in the endpoint, but it wouldn't consistently skew the concentration result.
Step 4
D. actual concentration of the standard NaOH solution was lower than the stated concentration.
Answer
This is indeed a systematic error because if the actual concentration is lower, every titration would indicate a higher amount of acid than is present. All titrations would be uniformly affected, leading to persistently erroneous conclusions about the concentration of the acid.