Temperature changes

• What type of reaction is being experimented on?

  Neutralization reaction
• What two substances are used in the experiment?

  Hydrochloric acid and sodium hydroxide
• Why are safety goggles used during the experiment?

  To protect eyes from harmful substances
• What is the purpose of using a polystyrene cup in the experiment?

  To minimize heat loss during the reaction
• How should the thermometer be positioned in the cup?

  It should not touch the bottom of the cup
• How much hydrochloric acid is poured into the measuring cylinder?

  30 cm³
• What is the correct method to measure the hydrochloric acid?

  Use a dropping pipette to reach 30 cm³
• What is the initial temperature recorded in the experiment?

  24° C
• What should be done after pouring sodium hydroxide into the cup?

  Quickly place the lid on the cup
• Why is it important to stir the solution gently?

  To evenly distribute heat energy
• What is the maximum temperature recorded after adding 5 cm³ of sodium hydroxide?

  26° C
• How should sodium hydroxide be added during the experiment?

  Add 5 cm³ increments each time
• What happens to the temperature as more sodium hydroxide is added?

  It may level out or drop at times
• What concept should be considered regarding limiting reactants?

  It affects the temperature change observed
• Why is it important to minimize heat loss during the experiment?

  To ensure accurate temperature readings
• What is the total volume of sodium hydroxide added at the end of the experiment?

  Up to 40 cm³
• What should be done after each addition of sodium hydroxide?

  Record the temperature after stirring
• What is the significance of the meniscus in measuring liquids?

  It indicates the accurate liquid level
• How does the experiment demonstrate an exothermic reaction?

  By showing temperature increases during neutralization
• What is the role of the lid during the experiment?

  To reduce heat loss from the solution