Acids, Bases, and pH Concepts

The video explores the properties and dangers of acids and alkalis, highlighting their common uses and safety precautions. It explains how indicators like red cabbage and universal indicators are used to measure pH levels. The video also discusses the environmental impact of acid rain and how power stations use limestone to neutralize sulfur dioxide emissions, turning them into gypsum. Practical applications and safety measures for handling these chemicals are emphasized throughout.

What is the primary danger associated with acids and alkalis?

• They can cause skin burns.

• They can emit pleasant smells.

• They can freeze objects.

• They can cause explosions.

Which of the following is NOT a common acid?

• Sodium hydroxide

• Vinegar

• Lemon juice

• Battery acid

What does the Latin word 'acidus' mean?

• Bitter

• Sharp

• Soft

• Sweet

What is the pH value of a neutral solution?

• 0

• 7

• 1

• 14

What color does red cabbage extract turn in an acidic solution?

• Green

• Yellow

• Red

• Blue

What is the pH of human blood?

• 14

• 7

• 6

• 3

What is another name for sodium hydroxide?

• Citric acid

• Caustic soda

• Vinegar

• Battery acid

What should be done if a strong alkali like sodium hydroxide is spilled?

• Use a vacuum cleaner.

• Leave it as it is.

• Dilute it with water.

• Cover it with sand and then dilute with water.

What is the main cause of acid rain?

• Burning coal in power stations

• Using too much limestone

• Spilling acids on the ground

• Using alkaline cleaning fluids

What is the chemical name for limestone?

• Gypsum

• Sulfur dioxide

• Calcium carbonate

• Calcium sulfate