Acid-Base Titration Concepts

The video explores the Rainbow Fizz experiment, focusing on pH levels and the use of indicators in titration. It explains the reactions of sodium carbonate with ethanoic acid and hydrochloric acid, highlighting the importance of choosing the right indicator. The video also delves into the concepts of pKa and equivalence points, and discusses the challenges of titrating weak acids and bases.

What color does a universal indicator turn when added to a solution with a pH below 3?

• Yellow

• Purple

• Red

• Green

What is the pH of a solution of sodium carbonate, commonly known as washing soda?

• 7

• 9

• 12.2

• 14

What is formed when sodium carbonate reacts with ethanoic acid?

• Sodium sulfate

• Sodium hydrogen carbonate

• Sodium chloride

• Sodium hydroxide

Which of the following is NOT a component of the universal indicator solution?

• Methyl orange

• Litmus

• Bromothymol blue

• Phenolphthalein

What happens to phenolphthalein when it is added to a solution with a pH of 8?

• It turns yellow

• It turns red

• It turns blue

• It becomes colorless

Why is it important to avoid fizzing during a titration?

• It changes the color of the indicator

• It can throw off the endpoint

• It increases the pH

• It decreases the pH

What does the pKa value of an indicator tell you?

• The volume of titrant needed

• The temperature of the solution

• The pH at which the indicator changes color

• The concentration of the indicator

What is the main challenge when titrating a weak acid with a weak base?

• The pH curve is too steep

• The pH curve is not steep enough

• The pH does not change

• The solution becomes too acidic

Which equation is used to relate the pH of a weak acid to its pKa?

• Charles's law

• Avogadro's law

• Henderson-Hasselbalch equation

• Boyle's law

What technique might be needed for titration involving a weak base and a weak acid?

• Using a stronger acid

• Using a pH probe

• Decreasing the volume

• Increasing the temperature