Litmus Paper and pH Testing

The video tutorial explains how to test the pH of everyday substances using litmus paper. It demonstrates how acids like lemon juice and vinegar turn the paper red, while bases like window cleaner and baking soda solution turn it blue. This simple method allows for easy classification of substances as acidic or basic, making chemistry exploration accessible in daily life.

What is the primary function of litmus paper in testing substances?

• To measure temperature

• To change the taste of substances

• To indicate if a substance is acidic or basic

• To clean surfaces

Which color does litmus paper turn when it comes into contact with an acidic substance?

• Yellow

• Green

• Red

• Blue

Which of the following substances is likely to turn litmus paper red?

• Water

• Lemon juice

• Window cleaner

• Baking soda solution

What color does litmus paper turn when exposed to a basic substance?

• Purple

• Orange

• Blue

• Red

Which of the following is an example of a basic substance?

• Milk

• Window cleaner

• Lemon juice

• Vinegar