Acids, alkalis, and salts

• A base is a metal oxide or hydroxide which neutralises an acid to produce a salt and water, and an alkali is a base that dissolves in water
• Neutralisation reactions are exothermic [produce heat]
• Neutralisation is the reaction between the hydrogen ions in an acid and the hydroxide ions in an alkali to produce water

  
  

  The equation is:

  
  

  H+(aq) + OH-(aq) -> H2O(l)