Practice Quiz

ACT Science Exam Prep

Category - ACT Science

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A student adds drops of lemon juice to a red cabbage pigment. What color is the solution most likely to be? Here is the pigment table for red cabbage:

pH 1-2: Pink, Acid
pH 3-4: Dark Red, Acid
pH 5-6: Violet, Acid
pH 7-8: Blue, Neutral-Base
pH 9-10: Blue-Green, Base
pH 11-12: Green-Yellow, Base
  1. Pink
  2. Blue
  3. Blue-green
  4. Greenish yellow
  5. Violet
Explanation
Answer: A - Lemon juice would most likely change the color of the pigment to pink.

Key Takeaway: A major component of lemon juice is citrate, a strong acid. After the addition of this acid to the pigment, it is most likely to reach a pH of about 2, which would result in the pigment turning pink.
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