Discover how red cabbage can act as a natural pH indicator, revealing whether substances are acids or bases through beautiful color changes. pH is a measure that tells us how acidic or basic a ...

Universal indicator has many different colour changes, from red for strongly acidic solutions to dark purple for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by green.

The colour of anthocyanins changes with pH from a yellowy green in very alkaline solutions, to a blue-ish purple in neutral solutions, to bright pink in acidic solutions.

The photographs below show the results using this pH indicator (pH 6 = Yellow / pH7.6 = Blue). Alternatively, you can use phenolphthalein pH indicator for a more dramatic result.

Students learned about the effective range of each indicator and practiced using the indicators’ color charts to determine pH. A Thymol blue B Thymolphthalein C Congo red D Cabbage E Bromothymol ...

Acid/base indicators are described and used to identify substances as acids or bases. Indicators and the pH Scale: Acid/base indicators are described and used to identify substances as acids or ...

Combining AI with paper-based sensors, this research offers a new approach to seafood freshness assessment, ensuring quality ...