Carbonates

• Lime is manufactured by limestone by heating

• CaC0~3~ + heat → CaO + CO~2~

• Uses of quick lime:

  • Making steel from iron

  • To neutralise acidity in soil

  • Drying agent in industry

• Uses of slaked lime and lime:

  • Neutralise acidity in soil, and in lakes affected by acid rain,

  • Neutralising acidic industrial waste products, e.g. flue gas desulphurisation

• Uses of limestone:

  • Making cement: made by mixing limestone with clay, heating mixture strongly in a kiln, adding gypsum (calcium sulphate), and grinding up the final solid to give a powder

  • Making iron from iron ore: limestone reacts with sand) forming slag (calcium silicate), which is then used for road building.