Red Cabbage Juice Chemistry

The video demonstrates an experiment using red cabbage juice as a pH indicator. It begins with preparing the juice by boiling red cabbage and then mixing it with various chemicals like water, lemon juice, ammonia, and bleach. The color changes observed indicate the acidity or basicity of the solutions. The video explains the concept of pH and how indicators work, highlighting the role of anthocyanin in red cabbage as a natural pH indicator. The experiment concludes with a summary of findings and an invitation for viewer interaction.

What is the first step in preparing red cabbage juice?

• Straining the cabbage juice

• Adding chemicals to the cabbage

• Cutting the cabbage into small pieces

• Boiling the cabbage

How long should the cabbage be boiled to extract the juice?

• 50 minutes

• 20 minutes

• 30 minutes

• 40 minutes

What happens to cabbage juice when mixed with water?

• It turns pink

• It turns green

• It remains purple

• It turns yellow

Which chemical turns cabbage juice pink?

• Water

• Ammonia

• Bleach

• Lemon juice

What is the pH level of a substance that turns cabbage juice green?

• Neutral

• Acidic

• Basic

• Salty

What is the purpose of an indicator in chemistry?

• To change the temperature of a solution

• To dissolve solids in a liquid

• To measure the volume of a liquid

• To indicate the acidity or basicity of a solution

What is a common type of indicator used to measure pH?

• Litmus paper

• Burette

• Measuring tape

• Thermometer

What chemical in red cabbage acts as a natural pH indicator?

• Tannin

• Carotene

• Anthocyanin

• Chlorophyll

How does anthocyanin in red cabbage respond to acids?

• It turns blue

• It turns green

• It turns pink

• It remains colorless

What color does anthocyanin turn in a basic solution?

• Yellow

• Purple

• Red

• Green