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In this practical you will:
• react different concentrations of sodium thiosulfate with hydrochloric acid
• use a stop clock to time how long it takes for the mixture to become cloudy for each
concentration
• use your results to work out how the rate of reaction changes as the concentration of the
sodium thiosulfate changes.
Apparatus
• 40 g/dm3 sodium thiosulfate solution
• dilute hydrochloric acid
• 10 cm3 measuring cylinder
• 100 cm3 measuring cylinder
• 100 cm3 conical flask
• printed black paper cross
• stopclock.
Method
1. Measure 10 cm3 sodium thiosulfate solution and put it into the conical flask.
2. Measure 40 cm3 of water. Add the water to the conical flask.
3. This dilutes the sodium thiosulfate solution to a concentration of 8 g/dm3.
4. Put the conical flask on the black cross.
5. Measure 10 cm3 of dilute hydrochloric acid.
6. Put this acid into the flask. At the same time swirl the flask gently and start the stopclock.
7. Look down through the top of the flask. Stop the clock when you can no longer see the cross.
Take care to avoid breathing in any sulfur dioxide fumes.
8. Record the time it takes for the cross to disappear in the table below. Record the time in
seconds.
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