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Which indicator is commonly used for a strong acid-strong base titration?

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Question: Which indicator is commonly used for a strong acid-strong base titration?

Options:

  1. Phenolphthalein
  2. Methyl orange
  3. Bromothymol blue
  4. Litmus

Correct Answer: Phenolphthalein

Solution: 

Phenolphthalein is commonly used as an indicator in strong acid-strong base titrations because it changes color at a pH around 8.2 to 10.

Which indicator is commonly used for a strong acid-strong base titration?

Practice Questions

Q1
Which indicator is commonly used for a strong acid-strong base titration?
  1. Phenolphthalein
  2. Methyl orange
  3. Bromothymol blue
  4. Litmus

Questions & Step-by-Step Solutions

Which indicator is commonly used for a strong acid-strong base titration?
Correct Answer: Phenolphthalein
  • Step 1: Understand what a titration is. It is a method used to determine the concentration of a solution by adding a solution of known concentration.
  • Step 2: Identify the types of solutions involved. In a strong acid-strong base titration, one solution is a strong acid (like hydrochloric acid) and the other is a strong base (like sodium hydroxide).
  • Step 3: Learn about indicators. Indicators are substances that change color at a certain pH level, helping to show when the reaction is complete.
  • Step 4: Know the pH range for strong acid-strong base titrations. The pH at the equivalence point (where the acid and base completely react) is around 7.
  • Step 5: Find out which indicator is suitable. Phenolphthalein is commonly used because it changes color in the pH range of 8.2 to 10, which is slightly above neutral.
  • Step 6: Conclude that phenolphthalein is a good choice for indicating the endpoint of a strong acid-strong base titration.
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