Titration Prelab

What is the equilibrium constant of a weak acid or base called?

• Ka or Kb
• Molarity
• Concentration
• pH

What is the purpose of adding phenolphthalein to the flask in a titration experiment?

• To indicate the endpoint of the titration by changing color

• To measure the pH of the solution
• To increase the temperature of the solution
• To neutralize the acid

What should be done if air bubbles are present in the buret tip during a titration experiment?

• Ignore the bubbles and continue the titration
• Open the stopcock to allow the bubbles to escape
• Add more acid to remove the bubbles
• Shake the buret vigorously

What is the concentration of the sodium hydroxide solution used in the titration experiment?

• 0.1M
• 0.01M
• 0.001M
• 1.0M

Which of the following materials is NOT needed for a titration experiment?

• Phenolphthalein indicator solution
• Sodium hydroxide
• Hydrochloric acid
• Bunsen burner

What is the color change observed when the endpoint of the titration is reached?

• Light pink
• Dark pink
• Blue
• Yellow

What is the purpose of a titration experiment in acid-base chemistry?

• To identify the color of a chemical compound
• To determine the concentration of an acid or base in solution
• To measure the volume of a liquid
• To calculate the density of a substance

What is the purpose of rinsing the walls of the flask with distilled water before reaching the endpoint of titration?

• To ensure accurate results
• To change the color of the solution
• To speed up the titration process
• To dilute the solution

What should be done if the solution in the Erlenmeyer flask turns light pink and stays pink for longer than 15 seconds during titration?

• Stop the titration and record the final volume of NaOH
• Continue adding NaOH until the solution turns dark pink
• Increase the rate of adding NaOH
• Add more hydrochloric acid

What is the volume of hydrochloric acid measured into the Erlenmeyer flask in the titration experiment?

• 30.0 mL
• 10.0 mL
• 40.0 mL
• 20.0 mL