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What affects the rate of reaction?A chemical reaction can be fast or slow. It just depends on what you do to it. In this activity you will try to measure how a chemical reaction is affected by temperature. When sodium thiosulphate and acid are mixed they produce a precipitate of sulphur. The mixture goes cloudy and we can measure how quickly it does so by using a light sensor connected to a computer. What to do
Get the computer ready to measure the light level over a period of a few minutes. Start the computer recording. Add 4ml acid to the flask. Stir quickly and take the temperature. Watch the trace on the computer while the reactants form a precipitate. Stop the computer recording and wash the flask. Look at your graph and:
Now think about the experiments you will do to show the effect of changing the temperature on the reaction rate. You need to do at least 4 different experiments at 4 different temperatures. Tell your teacher about your experiment plan. Do your experiments. Questions
ExtraDescribe an experiment to show the effect of sodium thiosulphate concentration on the rate of this reaction. Make a special point of mentioning the ways you can make this a fair test. Do your experiment if time permits. Taken from 'Enhancing Science with IT', copyright NCET 1994 |
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