Chemistry Required Practical: Temperature Changes

Includes;

- The Method (In Blue)

- Common Mistakes (In Yellow)

- Safety Notes (In Pink)

  • Created by: Hannah
  • Created on: 19-03-19 11:36
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  • Chemistry Required Practical: Temperature Changes
    • 1. Use the 50cm cubed measuring cylinder to put 30cm cubed Dilute Hydrochloric acid into the polystyrene cup.
      • 2. Stand the cup inside the beaker. This will make it more stable.
        • 3. Use the thermometer to measure the temperature of the acid.  Record it in the first blank column of the table such as the one below.
          • 4. Put 5cm cubed Sodium Hydroxide solution into the 10cm cubed measuring cylinder.
            • 5. Pour the Sodium Hydroxide into the cup.  Fit the lid and gently stir the solution with the thermometer through the hole. When the reading on the thermometer stops changing, write the temperature in the next space in the table.
              • 6. Repeat steps 4 and 5 to add further 5cm cubed amounts of Sodium Hydroxide to the cup. A total of 40cm cubed needs to be added. The last few additions should produce a temperature fall rather than a rise.
                • 7. Repeat steps 1–6 and record the results.
                  • 8. Calculate the mean maximum temperature reached for each of the sodium hydroxide volumes. Record the results.
                    • 9. Plot a graph with:- Mean maximum temperature in degrees celsius’ on the y-axis.- ‘Total volume of Sodium Hydroxide added in cm cubed’ on the x-axis. Then draw two lines of best fit - one through the points which are increasing and one through the points which are decreasing.
                      • 10. Use the graph to estimate how much Sodium Hydroxide solution was needed to neutralise 25cm cubed dilute Hydrochloric acid.
    • Wear eye protection at all times.
      • Avoid skin contact with the reactants.
        • Some reactions can be very exothermic. Don't touch hot reactions and take care not to get burnt.
    • Be sure to keep the bulb end of the thermometer in the liquid whilst taking a measurement
      • When the reaction takes place, stir the mixture to distribute the heat evenly.

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