Practice Quiz

Praxis II: Biology Content Knowledge Exam Prep

Category - Biology

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What color would the pigment be after tap water is added to it? Here is the table for reference:

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. Dark red
  3. Violet
  4. Blue
  5. Greenish-yellow
Explanation
Answer: D, blue. Adding tap water will result in a blue color.

Key Takeaway: The pigment is blue when it is at a neutral of slightly basic pH. Tap water has a pH or around 7, indicating it is a neutral substance. Therefore, adding tap water to the pigment will result in a blue color.
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