Question

the purpose of an indicator is to
a) test and determine the ph values of unknown solutions.
b) conduct electricity.
c) make a solution

Explanation:

• Option A: Indicators (like litmus, phenolphthalein) are used to test and determine the pH (acidity/alkalinity) of unknown solutions by changing color.
• Option B: Substances that conduct electricity are electrolytes, not indicators.
• Option C: Indicators do not make solutions; they are added to solutions to test properties.

Answer:

A) test and determine the pH values of unknown solutions.