Explore other natural indicators like turmeric, red rose extract, and olfactory indicators.
Hook about turmeric stains turning red.
How turmeric reacts to acids and bases.
Turmeric paste can be spread and dried onto paper to create turmeric paper, a simple natural indicator.
Pro tip: Turmeric is excellent for identifying basic substances, but it has a limitation when it comes to acids and neutrals.
Visual comparison of rose extract in acid vs. base.
You can make a natural indicator right at home by steeping red rose petals in hot water. The colored liquid left behind (the filtrate) acts as a powerful and vibrant acid-base indicator.
Red rose extract changes color distinctly based on what it mixes with:
Fascinating fact about Hydrangea plants acting as natural soil pH indicators.
Introduction to indicators that change smell, not just color.
Not all indicators rely on your eyes! Olfactory indicators are special substances whose odor (smell) changes depending on whether they are placed in an acidic or a basic medium.
Matching exercise for indicator color changes.
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