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Paper 6Alternative to PracticalPractical1 marks
Measuring the rate of a reaction between hydrochloric acid and sodium thiosulfate.
Method
Method for Measuring Reaction Rate
In this experiment, you will mix hydrochloric acid with sodium thiosulfate and observe the time taken for a cross to disappear.
| Step | Description |
|---|---|
| 1 | Measure 50 ml of sodium thiosulfate solution. |
| 2 | Add 10 ml of hydrochloric acid to the sodium thiosulfate. |
| 3 | Start a timer as soon as the acid is added. |
| 4 | Observe the cross under the solution and stop the timer when it is no longer visible. |
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State the independent variable in this experiment.
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