|Setting up practical|
Wednesday, 3 August 2011
X marks the spot
The theory topic for chemistry today was electrolytic cells electrolytic cells, fuel cells and secondary cells.
Today students learnt how to design an investigation. To practise their manipulative skills students performed a formative practical on the effect of concentration on
reaction rate. The academy chemistry students varied the concentration of thiosulphate.
When hydrocholoric acid was added to the sodium thiosulphate solution, a pale yellow precipitate of sulphur formed.
X was written on white piece of paper and placed under the conical flask. The students recorded the time it took for the X to disappear using a stop watch.
As the concentration of the sodium thiosulphate solution decreased, the time taken for the precipitate to form takes longer and longer.
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