Thermal decomposition of Limestone.

Thermal decomposition of Limestone.

1. limestone is mainly calcium carbonate.

   • heating it produces calcium oxide and carbon dioxide.
     • bubbling carbon dioxide through water makes it turn cloudy!

2. some carbonates undergo thermal decomposition more easily than others depending on stability.

3. sometimes there's a colour change in the substance

   • copper carbonate is green
     • copper oxide is black

4. add water to calcium oxide to get calcium hydroxide.

   • calcium hydroxide is used to neutralise acidic soil.
   • dissolves in water to create limewater.

5. this image shows 1) calcium carbonate thermally decomposing into carbon dioxide and calcium oxide . 2) calcium oxide being added to water to produce calcium hydroxide (limewater). 3) Calcium hydroxide reacts with carbon dioxide to form calcium oxide and water.

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