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Energetics

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Question 23

A student investigates the reaction between dilute nitric acid and aqueous sodium hydroxide in a polystyrene cup. She records the following data:

  • Volume of dilute nitric acid = 45.0 cm345.0\text{ cm}^345.0 cm3
  • Volume of aqueous sodium hydroxide = 45.0 cm345.0\text{ cm}^345.0 cm3
  • Initial temperature of both solutions = 19.1∘C19.1^\circ\text{C}19.1∘C
  • Final maximum temperature of the mixture = 26.3∘C26.3^\circ\text{C}26.3∘C
a.

Explain why a polystyrene cup is preferred over a glass beaker for this experiment.

[1]
b.

Calculate the heat energy change during this reaction, in joules (J\text{J}J), using the equation:

heat energy change=mass×4.18×temperature change \text{heat energy change} = \text{mass} \times 4.18 \times \text{temperature change} heat energy change=mass×4.18×temperature change

Assume that 1.0 cm31.0\text{ cm}^31.0 cm3 of each solution has a mass of 1.0 g1.0\text{ g}1.0 g.

[3]

Energetics Questions

  1. IGCSE
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  3. /Energetics