Final answer:
To ensure accuracy in a titration, air bubbles in the burette tip must be removed by opening the stopcock and letting the solution flow until the bubbles are expelled.
Step-by-step explanation:
If there are air bubbles in a burette tip when starting a titration, it's important to remove them before proceeding with the titration. These bubbles can lead to inaccurate volume measurements, which can skew the results of the titration. The best course of action is to allow the liquid to run through the buret until the bubbles are expelled. This may be done by opening the stopcock and letting the solution flow just enough to eliminate the bubbles from the tip. Ensuring there are no bubbles in the burette is crucial for precision in titrations.