Red Cabbage pH Indicator Experiment

The video tutorial demonstrates how to create an acid-base indicator using red cabbage. It begins with an introduction to acid-base indicators, followed by a list of materials and safety precautions. The experiment is conducted step-by-step, testing various solutions to observe color changes that indicate pH levels. The video explains the pH scale and how indicators work, using the natural pigment anthocyanin in red cabbage. It concludes with a summary and encourages viewers to engage by sharing their experiments.

What is the primary purpose of using red cabbage in this experiment?

• To observe bacterial growth

• To create a natural acid-base indicator

• To make a salad

• To test for vitamin C content

Which safety equipment is recommended for this experiment?

• Earplugs and a mask

• Helmet and knee pads

• Gloves, goggles, and an apron or lab coat

• Sunglasses and a hat

What is the first step in preparing the red cabbage indicator solution?

• Boil the cabbage leaves

• Mix cabbage with baking soda

• Blend red cabbage leaves with warm distilled water

• Add vinegar to the cabbage

What color does the red cabbage indicator turn when ammonia is added?

• Green

• Red

• Yellow

• Pink

Which household solution is slightly basic but close to neutral according to the experiment?

• Vinegar

• Tap water

• Lemon juice

• Ammonia

What is the pH of a neutral solution like water?

• 2.2

• 5

• 7

• 10

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

• Anthocyanin

• Carotene

• Chlorophyll

• Xanthophyll

How does the shape of molecules affect the color we perceive?

• It changes the temperature of the object

• It alters the wavelength of light reflected

• It affects the sound produced

• It modifies the texture of the object

What happens to the cabbage indicator when an acid is added?

• It reflects red wavelengths

• It becomes transparent

• It turns blue

• It emits a strong odor

What can destroy the pigment in the cabbage indicator completely?

• Using a strong solution like bleach

• Adding more water

• Exposing it to sunlight

• Heating the solution