MYP 6.1.6: A chemical reaction
- To observe and record a chemical reaction
- To prepare a solution from a solid and a solvent
- To construct and use a filtration system
- Accurately weigh out approximately 10g of citric acid using the electronic
- Prepare a solution of citric acid by dissolving the citric acid in
25cm3 of water in a small beaker.
- Add a spatula of sodium hydrogencarbonate and observe.
- When the reaction has ceased add another spatula of sodium hydrogen
carbonate. Repeat until no further reaction is observed.
The safety aspects must be discussed. The corrosive nature of acids.
If spilled on the skin or clothes walk to the sink and rinse with plenty
of water. If spilled on the bench, mop up with a wet cloth.
Before: Solid citric acid = white crystals.
Citric acid solution = colourless liquid
Sodium hydrogen carbonate = white powder
During: Effervescence (bubbling)
White powder disappears
After: Colourless transparent (clear) solution
Write-up: Criterion B - communication skills
Spotlight 7: p74-77