pH Levels and Color Changes

The video tutorial explores the pH levels of household window cleaner, specifically Windex, by comparing it to a strong acid and a strong base. The instructor demonstrates the use of pH paper to test sodium hydroxide, hydrochloric acid, and Windex, revealing that Windex has a pH of about 10, indicating it is a base. The video also shows how ammonia can neutralize an acid, changing the pH paper's color. The tutorial concludes with a summary of the findings.

What is the purpose of using pH paper in the experiment?

• To identify the chemical composition

• To check the color of the solution

• To determine the pH level of a substance

• To measure the temperature of the solution

What color does sodium hydroxide turn the pH paper?

• Light blue

• Yellow

• Bright red

• Dark purple

What is the approximate pH level of hydrochloric acid as shown in the video?

• 7

• 1

• 14

• 10

What pH level does Windex have according to the experiment?

• 14

• 10

• 7

• 1

How does the color of Windex on pH paper compare to sodium hydroxide?

• It is the same as sodium hydroxide

• It is darker than sodium hydroxide

• It is lighter than sodium hydroxide

• It is red like hydrochloric acid

What happens when ammonia is added to the pH paper with acid?

• The paper turns blue

• The paper remains red

• The paper turns the same color as the base

• The paper dissolves

What is the role of ammonia in the experiment?

• To increase the acidity

• To neutralize the acid

• To change the color to red

• To dissolve the pH paper

What is the main conclusion about Windex from the experiment?

• Windex is a base with a pH of about 10

• Windex has no effect on pH paper

• Windex is a strong acid

• Windex is neutral