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SAT Biology Subject Test Practice Questions

Category - Biology

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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 once again:

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, Pink. 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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