Cabbage Juice pH Indicator Concepts

The video tutorial explains how to use red cabbage juice as a pH indicator, a fun and educational experiment that can be done at home with children. It covers the preparation of the indicator, its limited shelf life, and the process of using it to test various household chemicals. The video also delves into the chemistry behind the color changes observed, particularly when strong bases like bleach are involved. The cabbage juice indicator is sensitive to a wide range of pH levels, making it a versatile tool for understanding acid-base reactions.

What is one of the main reasons the cabbage juice indicator is popular for home experiments?

• It has a long shelf life.

• It uses items commonly found at home.

• It requires rare chemicals.

• It is expensive to prepare.

What is a key advantage of using a blender to prepare the cabbage juice indicator?

• It is faster and more efficient than boiling.

• It enhances the aroma of cabbage.

• It makes the solution last longer.

• It requires more cabbage.

Why is testing household chemicals with the cabbage juice indicator described as a scavenger hunt?

• Because it is difficult to find chemicals.

• Because it involves searching for various chemicals at home.

• Because it requires professional lab equipment.

• Because it is a competitive activity.

What property of cabbage juice makes it a good pH indicator?

• Its ability to change color with temperature.

• Its sensitivity to acids and bases.

• Its resistance to strong chemicals.

• Its long-lasting color stability.

How does cabbage juice behave in the acidic range of the pH scale?

• It turns blue.

• It remains pink.

• It becomes colorless.

• It turns green.

What happens to the cabbage juice indicator when exposed to bleach?

• It loses its color.

• It becomes more vibrant.

• It turns bright red.

• It turns yellow.

Why does bleach cause the cabbage juice indicator to lose its color?

• Because bleach enhances the color.

• Because bleach is a strong base that destroys the indicator.

• Because bleach is neutral.

• Because bleach is a weak acid.

What is the main chemical component in bleach that affects the cabbage juice indicator?

• Sodium chloride

• Sodium hypochlorite

• Hydrochloric acid

• Ammonia

What is a benefit of using cabbage juice as an indicator in home projects?

• It is non-biodegradable.

• It is expensive to dispose of.

• It requires special disposal methods.

• It is biodegradable and easy to dispose of.

What is the typical color change of cabbage juice in a basic solution?

• It turns red.

• It turns green.

• It turns blue or green.

• It remains colorless.