Acidification of Water

The video explains how acids can corrode materials and demonstrates how breathing can produce acid using a simple experiment. It details the use of a universal indicator to show pH changes and explains the pH scale. The video also discusses the environmental impact of carbonic acid on oceans and marine life, highlighting the threat to biodiversity.

What materials are needed to demonstrate the production of acid by breathing?

• A glass jar, a funnel, some rainwater, and a color chart

• A test tube, a pipette, some salt water, and a pH meter

• A beaker, a thermometer, some tap water, and a litmus paper

• A conical flask, a drinking straw, some distilled water, and a chemical pH indicator

What color does the universal indicator turn when added to neutral distilled water?

• Blue

• Green

• Yellow

• Red

What does the color change from green to orange indicate in the experiment?

• The solution has become acidic

• The solution has become more alkaline

• The solution remains neutral

• The solution has evaporated

What weak acid is formed when carbon dioxide reacts with water?

• Carbonic acid

• Hydrochloric acid

• Sulfuric acid

• Nitric acid

What is the pH value of a neutral solution?

• 0

• 14

• 5

• 7

How does the pH value change when carbon dioxide is added to water in the experiment?

• It increases from 5 to 7

• It remains at 7

• It decreases from 7 to 5

• It increases from 7 to 9

What environmental issue is caused by the formation of carbonic acid in oceans?

• Increased biodiversity

• Improved water quality

• Decreased ocean acidity

• Threat to marine life