Which indicator is commonly used in a strong acid-strong base titration?
Practice Questions
Q1
Which indicator is commonly used in a strong acid-strong base titration?
Phenolphthalein
Methyl orange
Bromothymol blue
Litmus
Questions & Step-by-Step Solutions
Which indicator is commonly used in a strong acid-strong base titration?
Correct Answer: Phenolphthalein
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 of phenolphthalein. Phenolphthalein changes color in the pH range of about 8.2 to 10.
Step 5: Connect the indicator to the titration. Since the pH of a strong acid-strong base titration goes from acidic to basic, phenolphthalein is a good choice because it will change color when the solution becomes neutral or slightly basic.
