Photo AI
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 result indicates a volume of sodium hydroxide is required that is greater than expected for a solution of acetic acid, it implies that the acetic acid concentration is actually lower than what was assumed. Conversely, if the volume of sodium hydroxide used is less than expected, it indicates a higher concentration of acetic acid.
In this case, the student is asked to calculate the concentration given the titration results. The sodium hydroxide's concentration is standard, but since the acetic acid is of unknown concentration, unless the student obtains exact titration results, it is not possible to predict whether the calculated concentration of acetic acid is higher or lower than the actual concentration. Therefore, the best choice is:
B. higher.