A-Level CIE Chemistry 1.6 Energetics: You are to determine the enthalp

Question

You are to determine the enthalpy change of neutralisation for a different acid from that used in Question 1. The acid is represented by HB where B⁻ represents the anion.

HB(aq) + NaOH(aq) → NaB(aq) + H₂O(l)

FB 3 is 2.00 mol dm⁻³ acid, HB.
FB 4 is 72.00 g dm⁻³ sodium hydroxide, NaOH.

(a) Method

Read through the method before starting your practical work and prepare a table below for recording your results.

Experiment 1

- Place the plastic cup in the 250 cm³ beaker.
- Pour 25 cm³ of FB 3 into the larger measuring cylinder.
- Measure and record the temperature of FB 3.
- Rinse and dry the thermometer.
- Use the smaller measuring cylinder to transfer 25 cm³ of FB 4 into the plastic cup.
- Measure and record the temperature of FB 4.
- Add the 25 cm³ of FB 3 to FB 4 in the plastic cup and stir the mixture. Measure and record the highest temperature reached.
- Calculate and record the average initial temperature of the solutions.
- Calculate and record the temperature rise.
- Empty the plastic cup, rinse it with water and shake it to remove excess water.

Experiment 2

- Repeat the method given for Experiment 1 using 50 cm³ of each solution.
- Use the larger measuring cylinder for FB 3 and the smaller measuring cylinder for FB 4.

Results

You are to determine the enthalpy change of neutralisation for a different acid from that used in Question 1 - CIE - A-Level Chemistry - Question 2 - 2017 - Paper 1

Worked Solution & Example Answer:You are to determine the enthalpy change of neutralisation for a different acid from that used in Question 1 - CIE - A-Level Chemistry - Question 2 - 2017 - Paper 1

Method for Experiment 1

Method for Experiment 2

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