Test on Acid-base titration

Question 1: The volume of titrant delivered from a burette is determined by calculating the difference between its final and initial readings.

A. Yes

B. No

Explanation: The study materials state under 'Reading the Burette' that 'The volume of titrant used is the difference between the final and initial readings.'

Question 2: According to the study materials, what is the primary reason for performing multiple titrations, typically aiming for concordant readings?

A. To estimate the initial volume of the titrant before starting the actual titration.

B. To ensure accuracy and precision in the determined volume of titrant used.

C. To adjust the pH of the analyte solution to a neutral range before adding the titrant.

D. To identify the most suitable indicator for the specific acid-base reaction.

Explanation: The study materials state under 'Repeating the Titration' that 'Multiple titrations (usually three concordant readings, meaning within a small range like ±0.1 mL) are performed to ensure accuracy and precision.' While an initial rough titration can estimate the end point, the primary purpose of multiple concordant readings is for overall accuracy and precision of the experiment.

Question 3: Adding too much titrant past the equivalence point during a titration will result in an inaccurate end point.

A. Yes

B. No

Explanation: Over-titration, which involves adding too much titrant past the equivalence point, is explicitly stated to result in an inaccurate end point.

Question 4: Incomplete mixing during a titration can cause a delay in the indicator's color change.

A. Yes

B. No

Explanation: Not swirling the flask adequately can lead to localized neutralization and premature indicator color change, not a delay.

Question 5: During a titration, what is the direct consequence of having air bubbles present in the burette tip?

A. It causes the titrant volume to be measured artificially high.

B. It leads to localized neutralization within the flask.

C. It results in an inaccurate end point due to premature indicator color change.

D. It causes the pH at the equivalence point to be misidentified.

Explanation: According to the study materials, 'Air bubbles in Burette Tip: Air bubbles displace titrant volume, leading to an artificially high volume reading.' The other options describe consequences of other titration mistakes, such as incomplete mixing or incorrect indicator choice.