How to Prepare a Burette for a Titration

Summary

This video provides a step-by-step guide on how to properly prepare a burette for titration experiments. It covers the essential procedures, including cleaning, rinsing with the titrant, and filling the burette without contamination. Key tips for removing air bubbles from the burette and ensuring accurate volume readings are also highlighted. The video emphasizes maintaining cleanliness and careful handling of the burette throughout the process to achieve precise and efficient results in titration experiments.

Takeaways

• 😀 A burette is laboratory glassware used to deliver variable volumes of solutions while measuring the amounts accurately, often used in titration experiments.
• 😀 Before using the burette, it must be rinsed with the chemical solution, adding about 5 milliliters of titrant into it.
• 😀 Hold the burette horizontally and allow the solution to flow over its inner surface while placing an empty beaker under the open top to catch any excess solution.
• 😀 Rinse the burette with the solution two more times after the initial rinse to ensure cleanliness before filling.
• 😀 Clamp the burette perpendicular to the bench and place a funnel on top for filling. Ensure the tap is closed during this step.
• 😀 Fill the burette with the solution up to 2 to 3 centimeters above the 0 graduation line, then remove the funnel and wipe the outer surface of the burette.
• 😀 It's recommended to have an empty beaker under the burette while filling it to catch any accidental solution release.
• 😀 Be careful not to spill any solution on the outside of the burette, and clean it immediately with a paper towel if any spillage occurs.
• 😀 Open the tap briefly to let out some solution, ensuring the tip is free of air bubbles. Air bubbles can affect the volume readings.
• 😀 If there are air bubbles, three methods can be used to remove them: quickly opening and closing the tap, tapping the side of the burette, or gently shaking the burette up and down.
• 😀 Once all air bubbles are removed, refill the burette and ensure the lowest part of the meniscus is level with a graduation mark between zero and two milliliters before starting the titration.

Q & A

What is a burette and what is it used for?

A burette is a piece of laboratory glassware used to deliver variable volumes of solutions while accurately measuring the amount of solution delivered. It is commonly used in titration experiments.

What is the first step in preparing a burette for a titration experiment?

The first step is to clean the burette thoroughly. After cleaning, it should be rinsed with the chemical solution that will be used in the titration experiment.

Why is it important to rinse the burette with the titrant before filling it?

Rinsing the burette with the titrant ensures that the burette is free of any contaminants and that the titrant inside the burette is not diluted or affected by other chemicals.

How much titrant should be added to the burette for rinsing?

Approximately 5 milliliters of the titrant should be added to the burette for rinsing.

What should be done after the burette is rinsed with the titrant?

Once the burette is rinsed, it should be clamped perpendicular to the bench stand and filled with the titrant solution, making sure the tap is closed before filling.

What is the correct procedure for filling the burette with solution?

The burette should be filled using a small beaker, ensuring it is filled 2 to 3 centimeters above the 0 graduation line. The funnel should be removed after filling, and the outer surface of the burette should be wiped with a paper towel.

Why should the funnel be removed after filling the burette?

The funnel should be removed after filling to prevent any additional solution from dripping into the burette, which could lead to an incorrect volume reading.

What should be done if solution spills on the outside of the burette?

If the solution spills on the outside of the burette, it should be cleaned up immediately with a paper towel to avoid contamination or incorrect readings.

How do you ensure there are no air bubbles in the burette tip?

To ensure no air bubbles are present, you can either rotate the tap quickly, tap the side of the burette tip while the solution is flowing, or gently shake the burette up and down while the solution flows.

What is the importance of removing air bubbles from the burette tip?

Air bubbles in the burette tip can cause inaccurate volume readings, as they contribute to a dead volume, leading to an incorrect measurement of the solution dispensed.

How should you adjust the burette before starting a titration?

Before starting the titration, open the burette tap and let some solution run out so that the lowest part of the meniscus is level with the graduation mark between zero and two milliliters. This ensures accurate volume measurement.