What Is The pH Scale

This video tutorial explores the pH scale and indicators used to determine if a substance is acidic, neutral, or alkaline. It explains how litmus paper and universal indicators work, providing examples of substances with different pH values. The video concludes with a summary of key points, emphasizing the importance of understanding pH levels and the use of indicators.

What color does red litmus paper turn in an alkaline solution?

• Red

• Blue

• Green

• Yellow

Which of the following is NOT a characteristic of the pH scale?

• 14 is extremely alkaline.

• It ranges from 0 to 14.

• 0 is extremely alkaline.

• 7 is neutral.

What is the pH value of stomach acid?

• 7

• 2

• 5.5

• 13

Which tool provides the most precise pH measurement?

• Universal indicator

• Blue litmus paper

• Red litmus paper

• pH meter

What is the pH range for alkaline substances?

• 0 to 6

• 7

• 8 to 14

• 0 to 14