An indicator changes color when it encounters an acid or base. There are many different types of indicators, some that are liquids and others that are concentrated on little strips of "litmus" paper.

IntroductionAn acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with ...

Use a dropper or straw to place several drops of the test liquid into the cup with the indicator. Record the color of the liquid in the cup below. To test another item, use a clean cup and fresh ...

IntroductionAn acid-base indicator is a substance that changes color as the pH of the solution changes. Indicators work because they are weak acids which when in solution, exist in equilibrium with ...

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 ...

Here's what to do: Label a piece of paper Acid, Base, and Control. Break off a few leaves of the cabbage. Then the leaves up and put them into a zip-closing plastic bag. Add about 1 cup of water, get ...

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 ...

The pH scale is used to measure acidity and alkalinity. When an acid is neutralised, it forms a salt. Part of Chemistry (Single Science) Acids, bases and salts ...

Colourful indicators from flower petals at the House of Science. Photo: SUPPLIED This week we conclude our home chemistry series with a lovely colourful experiment. The background Acid-base ...

Science presenter Jon Chase uses universal indicator to measure the pH of a solution. The pH of the oceans is slightly alkaline but the increase in carbon dioxide in the atmosphere is acidifying them.