Choosing the Right Indicator for Titration

The video tutorial explains how to choose suitable indicators for titration. It covers the importance of pH curves and the equivalence point, and how indicators help determine the endpoint when solutions are colorless. The tutorial provides examples of different indicators and their color changes at various pH levels. It emphasizes selecting indicators that change color within the pH range of the equivalence point. The video also discusses different titration scenarios, such as strong acid-weak base titrations, and the importance of choosing the right indicator for each scenario.

What is the primary function of an indicator in a titration?

• To act as a catalyst

• To neutralize the acid or base

• To change color at the equivalence point

• To increase the reaction speed

Which indicator changes color at around pH 9?

• Methyl orange

• Phenolphthalein

• Phenol red

• Bromothymol blue

Which indicator would not be suitable if the equivalence point is at pH 12?

• Methyl orange

• Bromothymol blue

• Phenolphthalein

• Indigo carine

What happens if an indicator changes color after the equivalence point has been passed?

• It's too late to determine the end point accurately

• The titration is considered successful

• It indicates the need for more titrant

• The pH will remain constant

Why is it important to choose an indicator that changes color within the vertical portion of the pH curve?

• To accurately indicate the equivalence point

• To guarantee the reaction is complete

• To ensure a dramatic visual effect

• To prevent the decomposition of the indicator

What is the consequence of using an unsuitable indicator in a titration?

• The end point will not be accurately determined

• The titration will require more titrant

• The solutions will react differently

• The titration will be faster

What does the steep vertical portion of a pH curve in a titration indicate?

• The beginning of the titration

• The end of the titration

• The equivalence point

• The saturation point of the titrant

In a titration of a strong base against a weak acid, which indicator would be appropriate?

• Bromocresol green

• Phenol red

• Methyl orange

• Phenolphthalein

What would be a false indication in a titration involving a weak acid and a strong base using methyl orange?

• The titration is incomplete

• The equivalence point is reached at a lower pH

• The pH jumps beyond the color change range

• The indicator does not change color

For a titration involving a strong acid and a weak base, which indicator would be inappropriate?

• Methyl orange

• Litmus

• Bromocresol green

• Phenolphthalein