Red Cabbage pH Indicator Concepts

The video tutorial demonstrates how to create a universal pH indicator using red cabbage. It begins with cutting and blending the cabbage, followed by adding boiling water to extract anthocyanin dye. The solution is then filtered and diluted for use. The instructor demonstrates the pH indicator's effects by testing it with various substances, including sulfuric acid, acetic acid, soda water, water, baking soda solution, ammonia, and sodium hydroxide, showcasing a range of pH levels from acidic to basic.

What is the first step in preparing the red cabbage for the pH indicator experiment?

• Add vinegar to the cabbage

• Cut the cabbage into four parts

• Boil the cabbage

• Freeze the cabbage

What natural dye is extracted from red cabbage to make the pH indicator?

• Carotene

• Chlorophyll

• Anthocyanin

• Xanthophyll

How long should you wait after adding hot water to the cabbage for the dye to be released?

• 5-10 minutes

• 15-20 minutes

• 30-40 minutes

• 1 hour

Which substance has a pH level of 1 when tested with the red cabbage pH indicator?

• Baking soda solution

• Ammonia

• Sulphuric Acid

• Sparkling water

What is the pH level of baking soda solution as shown in the demonstration?

• pH = 4

• pH = 1

• pH = 8-9

• pH = 12