Temperature change

• Temperature change method;

  1. Firstly, add 25cm^3 of hydrochloric acid into a polystyrene cup and place cup inside beaker and put cotton wool between cup and wool.
  2. Secondly, measure the initial temperature of hydrochloric acid.
  3. Then, measure 5cm^3 of sodium hydroxide and add to polystyrene cup and quickly place a lid and gently stir.
  4. Place a thermometer through the whole in the lid and when the temperature stops changing record it.
  5. Finally, repeat steps 1-7 with different volumes of sodium hydroxide, and then repeat again to have a mean of each volume.
• To measure temperature more precisely use a digital thermometer and to be more reliable the repeat the experiment.