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In a titration to determine the presence of acetic acid, which indicator would b

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Question: In a titration to determine the presence of acetic acid, which indicator would be most appropriate?

Options:

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

Correct Answer: Phenolphthalein

Solution: 

Phenolphthalein is the most appropriate indicator for titrating weak acids like acetic acid against strong bases, as it changes color at the relevant pH range.

In a titration to determine the presence of acetic acid, which indicator would b

Practice Questions

Q1
In a titration to determine the presence of acetic acid, which indicator would be most appropriate?
  1. Phenolphthalein
  2. Methyl orange
  3. Bromothymol blue
  4. Litmus

Questions & Step-by-Step Solutions

In a titration to determine the presence of acetic acid, which indicator would be most appropriate?
  • Step 1: Understand what a titration is. It is a method used to determine the concentration of a substance in a solution.
  • Step 2: Identify the substance being tested. In this case, it is acetic acid, which is a weak acid.
  • Step 3: Know what acetic acid is being titrated against. It is usually titrated against a strong base, like sodium hydroxide.
  • Step 4: Learn about indicators. Indicators are substances that change color at a certain pH level, helping to show when the reaction is complete.
  • Step 5: Find out the pH range where acetic acid and a strong base will react. This typically occurs around pH 8-10.
  • Step 6: Choose an appropriate indicator. Phenolphthalein is a good choice because it changes color in the pH range of 8.2 to 10, which is suitable for this titration.
  • Step 7: Conclude that phenolphthalein is the most appropriate indicator for this titration.
  • Titration – A technique used to determine the concentration of a solute in a solution by reacting it with a solution of known concentration.
  • Indicators – Substances that change color at a specific pH range, used to signal the endpoint of a titration.
  • Weak Acids vs. Strong Bases – Understanding the behavior of weak acids like acetic acid when titrated with strong bases, which affects the choice of indicator.
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