When using litmus paper to differentiate between casein and peptone, what color does casein turn the paper?
Understand the Problem
The question is asking about the color change of litmus paper when it comes into contact with casein, as compared to peptone. This involves understanding the properties of these substances and how they interact with acid-base indicators like litmus paper.
Answer
Casein turns the litmus paper blue.
Casein can turn the litmus paper blue when it is partially digested, as it produces ammonia which raises the pH.
Answer for screen readers
Casein can turn the litmus paper blue when it is partially digested, as it produces ammonia which raises the pH.
More Information
Casein produces ammonia upon partial digestion, which is a base. This raises the pH and turns the litmus paper blue.
Tips
A common mistake is assuming casein itself changes the litmus color. It's the byproduct ammonia that influences the change.
Sources
- Litmus Milk Test: Principle, Procedure, and Results - Microbe Online - microbeonline.com
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