Acids

• Acids


  Contain very reactive particles called Hydrogen ions
• Alkalis


  Contain very reactive particles called Hydroxide ions
• Neutralisation


  When an acid is added to an alkali, they cancel one another out
• Everyday neutralisation reactions


  • Toothpaste
  • Saliva
• Tooth decay


  1. Bacteria live and feed on sugars for energy

  2. Produce acid that attacks tooth enamel
• Safety equipment


  • Safety glasses
  • Gloves/protective clothing
  • Eye wash station
• Litmus paper


  • Blue litmus paper used to test for acids
  • Red litmus paper used to test for alkalis
• Colour changes with pH

  • Very strong acid - red
  • Acid - red
  • Neutral - blue
  • Alkali - blue
  • Very strong alkali - blue
• Types of teeth

  • Molar
  • Premolar
  • Canine
  • Incisor
• Methods to reduce/prevent tooth decay

  • Brush teeth regularly
  • Limit sugary foods and drinks
  • Visit dentist
  • Use fluoride
• Hazard


  • explosive
  • pressure
  • Toxic
  • Enviorma
  • corrosive
  • Flammermu
• Copper Sulfate


  gas under moderate Health Hazard
• Acids and alkalis: How to use indicator:
• Acids contain very reactive particles called Hydrogen ions.
• Corrosive

  Moderate hazard

  Flammable

  Health hazard

  Toxic

  Environmental hazard

  Explosive

  Gas under pressure

  Oxidizing
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