Acids and bases

• pH Scale


  Goes from 0 to 14
• pH


  A measure of how acidic or alkaline a solution is
• The lower the pH of a solution

  The more acidic it is
• The higher the pH of a solution


  The more alkaline it is
• Neutral solutions have a pH of 7
• Acids


  • Solutions with pH less than 7
• Alkalis


  • Solutions with pH greater than 7
• Neutralisation


  The reaction between an acid and a base
• Neutralisation reaction


  Acid + Base → Salt + Water
• When an acid neutralises a base (or vice versa), the products are neutral with a pH of 7
• Indicators can be used to show that a neutralisation reaction is over
• Skin has a slightly acidic pH of 5.5