Edexcel IGCSE Chemistry 复习笔记 3.1.6 Practical: Investigating Temperature Changes

Aim:

To perform a calorimetry study of the reaction between HCl and NaOH

Materials:

• Dilute hydrochloric acid
• Dilute sodium hydroxide solution
• Styrofoam (polystyrene) calorimeter & lid
• 25 cm³ measuring cylinder
• Thermometer & stirrer

Diagram showing the apparatus for the calorimetry investigation for displacement, dissolving and neutralisation

Method:

1. Using a measuring cylinder, place 25 cm³ of the NaOH solution into the calorimeter
2. Measure and record the temperature of the solution
3. Add 5 cm³ of the dilute HCl and stir
4. Measure and record the highest temperature reached by the mixture
5. Repeat steps 1 – 4 increasing the amount of acid added by 5 cm³ each time

Results:Record your results in a suitable table, eg:

Evaluation:

Plot a graph of the results and draw a line of best fit, using the graph to determine what volume of acid causes the biggest change in temperatureConclusion:The larger the difference in the temperature the more energy is absorbed or released

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