Titration Techniques and Calculations

The video tutorial covers a titration lab using a dropper as a burette. It begins with calibrating the dropper, preparing a diluted vinegar solution, and performing the titration using potassium hydroxide (KOH) and phenolphthalein as an indicator. The tutorial explains how to analyze the results, calculate the concentration of acetic acid in vinegar, and discusses potential errors in the experiment. The video emphasizes careful dropwise addition and stirring to achieve accurate results.

What is the purpose of calibrating the dropper in the titration experiment?

• To measure the exact volume of vinegar

• To determine the concentration of the base

• To clean the dropper before use

• To ensure consistent drop size for accurate titration

How many drops per milliliter should you expect when calibrating the dropper?

• 20 drops

• 25 drops

• 15 drops

• 10 drops

What is the dilution ratio used when preparing the vinegar solution?

• 1:10

• 1:5

• 1:15

• 1:20

What is the role of phenolphthalein in the titration process?

• It is used to neutralize the acid

• It acts as a base

• It is used to dilute the solution

• It serves as an indicator for the endpoint

What color change indicates the endpoint of the titration?

• From pink to purple

• From clear to pink

• From pink to clear

• From purple to clear

How is the concentration of the acid determined after the titration?

• By measuring the final volume of the solution

• By counting the number of drops added

• By measuring the initial volume of the acid

• By using the molarity of the base and the volume of the base used

What is the molar mass of acetic acid used in the calculations?

• 44 grams per mole

• 48 grams per mole

• 52 grams per mole

• 56 grams per mole

What was the calculated concentration of the vinegar solution?

• 0.11 M

• 1.10 M

• 0.10 M

• 1.01 M

What could cause an artificially high concentration reading in the titration?

• Using a lower concentration of base

• Not stirring the solution enough

• Using too little phenolphthalein

• Adding too much vinegar to the well plate

How can you correct an over-titration without starting over?

• Add more phenolphthalein

• Add more water

• Add more base

• Add more diluted vinegar