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A student used the following method to titrate an acetic acid solution of unknown concentration with a standardised solution of dilute sodium hydroxide - HSC - SSCE Chemistry - Question 5 - 2021 - Paper 1
Question 5
A student used the following method to titrate an acetic acid solution of unknown concentration with a standardised solution of dilute sodium hydroxide. • Rinse bur... show full transcript
Worked Solution & Example Answer:A student used the following method to titrate an acetic acid solution of unknown concentration with a standardised solution of dilute sodium hydroxide - HSC - SSCE Chemistry - Question 5 - 2021 - Paper 1
Step 1
Compared to the actual concentration of the acetic acid, the calculated concentration will be
Answer
When performing a titration, if the endpoint is reached accurately, the calculated concentration of acetic acid will depend on the volume of sodium hydroxide used relative to its known concentration. If the student accidentally titrated to a higher endpoint or misjudged the endpoint due to the indicator change, the volume of sodium hydroxide recorded might be larger than expected. This would result in a calculation for the concentration of the acetic acid that is higher than the actual concentration.
Consequently, since proper procedure was followed but errors can occur in endpoint determination, the most appropriate answer is:
B. higher.