1. |
50cm3 of sodium thiosulphate, Na2S2O3 0.2mol dm-3, is measured with a measuring cylinder and poured it into a conical flask. |
2. |
A cross 'X' is drawn in the middle of the filter paper. A conical flask containing the sodium thiosulphate solution is placed on top of the marked filter paper. |
3. |
The cross 'X' can be easily seen through the conical flask containing the sodium thiosulphate solution. |
4. |
5cm3 of hydrochloric acid 0.2mol dm-3 is measured by measuring cylinder. |
5. |
The hydrochloric acid is added quickly into the conical flask containing sodium thiosulphate solution. |
6. |
The conical flask solution is swirled slowly. |
7. |
The stopwatch is stopped when the cross can no longer be seen from the above. |
8. |
The time taken for cross 'X' disappear are recorded. |
9. |
The experiment is repeated by using different volumes of sodium thiosulphate, hydrochloric acid and distilled water. |
10. |
This video shows the observation on the effect of concentration on the rate of reaction.
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