Multiple choice

Which of the following options are indicators?

  1. Litmus

  2. Methyl orange

  3. Phenolphthalein

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Litmus, methyl orange, and phenolphthalein are all acid-base indicators that change color depending on pH. Litmus turns red in acid, blue in base. Methyl orange is red in acid, yellow in base. Phenolphthalein is colorless in acid, pink in base. All three are valid indicators.

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