What indicator is commonly used in a strong acid-strong base titration?

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Question: What indicator is commonly used in a strong acid-strong base titration?

Options:

Correct Answer: Phenolphthalein

Solution:

Phenolphthalein is commonly used as an indicator in strong acid-strong base titrations due to its clear color change at neutral pH.

What indicator is commonly used in a strong acid-strong base titration?

What indicator is commonly used in a strong acid-strong base titration?

Step 1: Understand what a titration is. A titration 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, you have a strong acid (like hydrochloric acid) and a strong base (like sodium hydroxide).
Step 3: Learn about indicators. An indicator is a substance that changes color to show whether a solution is acidic or basic.
Step 4: Know the pH range for neutral solutions. A neutral solution has a pH of around 7.
Step 5: Find out which indicator is suitable. Phenolphthalein is commonly used because it changes color at a pH around 8.2 to 10, which is close to neutral.
Step 6: Conclude that phenolphthalein is the indicator used in strong acid-strong base titrations due to its clear color change at neutral pH.

Titration – A technique used to determine the concentration of a solution by reacting it with a solution of known concentration.
Indicators – Substances that change color at a specific pH level, used to signal the endpoint of a titration.
pH and Neutralization – The pH scale measures acidity and basicity, with neutralization occurring at a pH of around 7.