Why is swirling important in titration?

By swirling you spread the base throughout the whole of the liquid quickly, so the purple colour will only stay if the total amount of base is dominant over the total amount of acid.

Why is it important to swirl or shake the contents of the flask during addition of acid?

This is because there is no more acid in the flask to react with the base that has been added. To get the most accurate measurement of how much base is needed to react with the acid, we need to ensure the solutions are continuously mixed together well so that they can fully react.

Why is it important to swirl the solution as the NaOH is added?

It important to swirl the solution each time before you add additional NaOH to ensure that it is entirely mixed.

Why is it important to keep a titration well mixed?

Swirling: It is important to keep a titration well mixed, so the acid and alkali can rapidly contact each other. You can either manually swirl the flask or use mechanical stirring.

What is the use of phenolphthalein?

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

How do you ensure the accuracy of the volume of titrant used in a titration?

Standardize Your Titrant Standardization is a procedure that normalizes the titration system and provides the most accurate titrant concentration. This value is critical in the final calculation for the analyte content. If the concentration is not known precisely, it can throw off a result.

Why is it important to ensure the tip of the burette is filled?

Filling the burette this way is also useful because it means the space under the tap is also filled with liquid. This is important, as the burette is calibrated to include this volume. When the end point is reached, the burette tap is closed, and the volume of alkali added is recorded.

Why the volumetric flask must be stoppered and shaken?

Because the volume may change at mixing of a sample and a solvent, the sample should not be diluted directly to the marked line without stopping. After the final dilution, the solution is mixed thoroughly, by inverting the flask and shaking. The mixing is not enough when it is shaken without inverting.

What does it mean when the titration turns pink?

The phenolphthalein indicator is added into the unknown concentration. When the solution turns from colorless to pink (or vice versa), the titration or neutralization point has been reached, and the unknown concentration may be calculated. In the past, phenolphthalein has been used as a laxative.

Why is it important to wash the inside of the titration flask?

In a titration, it is important to wash the inside of the titration flask with distilled or deionised water as you approach the end-point. to obtain concordant results. – Once all the water is removed the mass will remain constant signifying there is no more water in the solid.

Why do you rinse the conical flask with distilled water during the titration?

During a titration, a chemist rinsed the inside of the conical flask with deionised water. To make sure all the acid/alkali is at the bottom of the conical flask and can react, because as you swirl the acid/alkali can travel up the sides of the flask.

Why is phenolphthalein indicator needed in titration?

A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions. Neutralization is the basis of titration.