Indicators in Chemistry

The video tutorial introduces the concept of indicators, which help identify acidic, basic, and neutral substances without tasting them. It explains how turmeric and litmus paper act as indicators, changing color when in contact with acids or bases. The tutorial also demonstrates how to create natural indicators using hibiscus flowers and beetroot, highlighting their color-changing properties in different solutions.

Why can't we test all substances by tasting them to determine if they are acidic or basic?

• Some substances are dangerous and can harm us.

• Some substances are too expensive.

• Tasting is not a reliable method.

• All substances taste the same.

What happens to a turmeric stain when it comes into contact with a basic substance like soap?

• It turns blue.

• It remains yellow.

• It turns red.

• It turns green.

How does lemon juice affect a turmeric stain that has turned red due to soap?

• It has no effect.

• It turns the stain yellow again.

• It turns the stain green.

• It turns the stain blue.

What is the natural color of litmus in a neutral solution?

• Red

• Blue

• Purple

• Green

What color does blue litmus paper turn when it comes into contact with an acidic substance?

• Purple

• Red

• Green

• Yellow

What happens to red litmus paper when it is exposed to a basic substance?

• It turns green.

• It turns red.

• It remains unchanged.

• It turns blue.

Which flower can be used to create a natural indicator at home?

• Daisy

• Sunflower

• Hibiscus

• Rose

What color does the hibiscus indicator turn when a basic substance is added?

• Red

• Green

• Yellow

• Blue

What color does the hibiscus indicator turn when an acidic substance is added?

• Magenta

• Blue

• Green

• Yellow

What is the primary role of indicators in chemistry?

• To determine the acidity or basicity of substances.

• To identify the color of substances.

• To make substances more reactive.

• To change the taste of substances.