I WONDER - How Is PH Measured?

The video tutorial explains how pH meters provide precise pH measurements and discusses the use of universal indicator paper, which changes color based on pH levels. It also covers litmus paper, which turns red in acidic solutions, blue in basic solutions, and remains unchanged in neutral solutions.

What tool is used for precise pH measurements?

• Color key card

• Litmus paper

• pH meter

• Universal indicator paper

What does universal indicator paper do when it comes into contact with a substance?

• It changes color based on the pH

• It becomes transparent

• It dissolves in the substance

• It emits a smell

How does indicator paper determine the pH level of a substance?

• By changing texture

• By changing color for each pH unit

• By changing shape

• By changing temperature

What color does litmus paper turn in an acidic solution?

• Blue

• Green

• Red

• Yellow

What happens to litmus paper in a neutral solution?

• It remains unchanged

• It turns blue

• It turns red

• It turns green