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What Color Do Acids Turn Litmus Paper

Sarah Jenkins • • 8 min read
What Color Do Acids Turn Litmus Paper
It’s because of 7-hydroxyphenoxazone. When exposed to acids below pH 4.5, the molecule looks like the image below and this gives litmus paper its red color. As the pH of the test solution moves towards alkaline, one of the hydrogen atoms (white hemispheres) starts to break off (disassociate).

What color will an acid turn litmus paper and what does an acid taste like?

Acids are compounds with specific characteristic properties. An acid reacts with metals and carbonates, tastes sour, and turns blue litmus paper to red.

What Colour does yellow litmus paper turn in acid?

Litmus indicator solution turns red in acidic solutions, blue in alkaline solutions, and purple in neutral solutions.

Sarah Jenkins
Author

Sarah Jenkins

Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.