practical 3 - rates

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Last updated 4:08 PM on 6/13/26
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4 Terms

1
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What reactants are used to investigate how the rate of a reaction changes with temperature?

Give an equation

Sodium thiosulfate and hydrochloric acid

Na2S2O3 + 2HCl → 2NaCl + SO2 + S + H2O

2
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How do we know when this reaction ends?

Reaction mixture goes cloudy due to sulfur

3
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Describe the method to investigate how the rate of a reaction changes with temperature

  1. Measure 10cm3 of 0.2moldm-3 HCl and 10cm3 of sodium thiosulfate in separate clean measuring cylinders. Put the solutions in separate boiling tubes

  2. Choose a temperature to investigate - use water bath to get the two solutions to this temperature by placing the boiling tubes in the water bath

  3. Place the flask on the centre of the large cross

  4. First add the sodium thiosulfate, then add the HCl and start the stopwatch and swirl to mix the solutions

  5. Stop the clock when the cross disappears and note the time

  6. Repeat the experiment for four more different temperatures

4
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How to calculate rate at each temperature

1/t