Chap 6

• What is the pH value of an acid?

  Less than 7
• What is the pH value of an alkali?

  More than 7
• How does an acid taste compared to an alkali?

  An acid tastes sour, while an alkali tastes bitter
• What is a common property of both acids and alkalis?

  Both are corrosive
• What color does blue litmus paper turn when exposed to an acid?

  Red
• What color does red litmus paper turn when exposed to an alkali?

  Blue
• What gas is produced when acids react with metals?

  Hydrogen gas
• What are examples of acidic and alkaline substances?

  • Acidic: Vinegar
  • Alkaline: Soap
• What is an indicator in chemistry?

  An indicator is a substance that changes color based on the substance tested
• What are the color changes of phenolphthalein in different pH conditions?

  • Acid & neutral: Colourless
  • Alkali: Pink
• What are the color changes of a universal indicator in different pH conditions?

  • Acid: Red
  • Neutral: Green
  • Alkali: Blue
• What are the color changes of methyl orange in different pH conditions?

  • Acid: Red
  • Neutral and Alkali: Yellow
• What are the color changes of blue litmus paper in different pH conditions?

  • Acid: Red
  • Neutral and Alkali: Blue
• What are the color changes of red litmus paper in different pH conditions?

  • Acid and neutral: Red
  • Alkali: Blue
• What does the pH scale indicate about acids and alkalis?

  The pH scale shows the strength of acids or alkalis
• How does the pH value relate to the strength of an acid?

  The lower the pH value, the stronger the acid
• How does the pH value relate to the strength of an alkali?

  The higher the pH value, the stronger the alkali
• What is an example of an acid used in daily life?

  Tartaric acid
• What is an example of a fizzy drink acid?

  Carbonic acid
• Which acid is commonly found in car batteries?

  Sulphuric acid
• What acid is used in pickling?

  Vinegar
• What is an example of an alkali used in soap?

  Potassium hydroxide
• Which alkali is commonly used in fertilizers?

  Ammonia
• What alkali is used in detergents?

  Sodium hydroxide
• What is an example of an alkali found in antacid pills?

  Magnesium hydroxide
• What are some common uses of acids in daily life?

  • Tartaric acid
  • Carbonic acid (in fizzy drinks)
  • Sulphuric acid (in car batteries)
  • Vinegar (in pickling)
• What are some common uses of alkalis in daily life?

  • Potassium hydroxide (in soap)
  • Ammonia (in fertilizers)
  • Sodium hydroxide (in detergents)
  • Magnesium hydroxide (in antacid pills)