Baking with bubbles

1
Baking with bubbles

• L.O.
• Describe reactions of acids with metal
  carbonates and metal hydrogen carbonates.
• Describe sodium hydrogen carbonate as baking
  powder.
• The use in the home of carbon dioxide .
• How to collect carbon dioxide
• A test for carbon dioxide.

2

• Demo

3
Neutralisation Reactions carbonates

• Each carbonate ion provides one oxygen to join
  with two H ions. At the same time carbon dioxide
  is released.

Carbonates 2H CO32- ? H2O CO2
Eg. Potassium hydrochloric ? water
carbon potassium carbonate
acid dioxide chloride K2CO3 2HCl ?
H2O CO2 2KCl
Eg. calcium nitric ? water carbon
calcium carbonate acid dioxide
nitrate CaCO3 2HNO3 ? H2O CO2 Ca(NO3)2
4

• Which salt is produced when
• Sodium carbonate reacts with hydrochloric acid
• Sodium chloride
• Sodium hydrogen carbonate reacts with sulphuric
  acid?
• Sodium sulphate

5

• Ways of collecting carbon dioxide
• Gas syringe
• Downward delivery
• Over water

6
Sodium hydrogen carbonate is used as baking
powder. The baking powder also contains a dry
acid. Moisture in the cake allows for both of
them to react releasing carbon dioxide.
7

• A test for carbon dioxide
• It turns limewater cloudy white

8

• Uses in the home of carbon dioxide.

9
Baking with bubbles

• L.O.
• Describe reactions of acids with metal
  carbonates and metal hydrogen carbonates.
• Describe sodium hydrogen carbonate as baking
  powder.
• The use in the home of carbon dioxide .
• How to collect carbon dioxide
• A test for carbon dioxide.

10
Breaking down in the heat

• L.O.
• Describe the thermal decomposition of carbonates
  and hydrogen carbonates.

11
Thermal decomposition of copper carbonate

• Demo.
• Draw a sketch of the experiment and write down
  your observations

Copper carbonate ? copper oxide carbon dioxide
12
Hydrogen carbonates

• Hydrogen carbonates also break down to release
  carbon dioxide when heated, but different
  products are formed. Here are the equations for
  the thermal decomposition of sodium hydrogen
  carbonate
• sodium hydrogen carbonate ? sodium carbonate
  carbon dioxide water
• 2NaHCO3 ? Na2CO3  CO2  H2O

13

• test

14

• Collecting gases

15
Breaking down in the heat

• L.O.
• Describe the thermal decomposition of carbonates
  and hydrogen carbonates.