acids and bases

• Acids


  A substance that has a hydrogen ion (H+) and a pH lower than 7
• Bases


  A substance that has a hydroxide ion (-OH) and a pH higher than 7

  Soapy feel - sodium hydroxide (drain cleaner)
• Neutralization reactions


  • Bee sting (weak acid) + baking soda (weak base) = Neutralised
  • Wasp sting (weak base) + Vinegar (weak acid) = Neutralised
• Rennie


  These bases bind and neutralize excess stomach acid (gastric acid/ hydrochloric acid)
• Litmus Paper

  Blue goes RED (acid)

  Red goes BLUE (base)

  Blue stays BLUE (base)

  Red stays RED (acid)