What happens when you add an acid to red litmus paper, and how do different substances affect the color of cabbage juice?
Understand the Problem
The text provides information about indicators and pH levels, specifically how certain substances affect the color of litmus paper and the pH scale. It defines what an indicator is, discusses acid-base reactions related to litmus paper colors, and provides a table with the effects of different substances on cabbage juice color.
Answer
Red litmus paper stays red in acids. Cabbage juice turns red in acids and green in bases.
The final answer is red litmus paper stays red in acidic solutions, and cabbage juice changes color based on pH: red in acids, green in bases.
Answer for screen readers
The final answer is red litmus paper stays red in acidic solutions, and cabbage juice changes color based on pH: red in acids, green in bases.
More Information
Red litmus paper is an indicator that stays red in acidic solutions and turns blue in basic ones. Red cabbage juice, containing anthocyanin, is versatile as it changes across a spectrum, red in acids and green in bases.
Tips
A common mistake is thinking that litmus paper changes to red when exposed to acids; only blue litmus paper turns red.
Sources
- Red Cabbage Chemistry - Steve Spangler - stevespangler.com
- Cabbage Juice Indicator - Science World - scienceworld.ca
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