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2 marksTitrimetric (Volumetric) Methods of Analysis

CAPE Chemistry Unit 2 · January 2021 · Paper 2 · Question 1(b)(ii)

Draw two lines of best fit through the points on the graph, one where the temperature is increasing and the other where the temperature is decreasing.

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  1. 1(a)Using the thermometer readings in Figure 1, on page 5, complete Table 1 by recording the temperatures for the additions of 5 cm³, 15 cm³ and 25 cm³ of H₂SO₄.[3 marks]
  2. 1(b)(i)Using the axes provided in Figure 2, on page 7, plot the graph of temperature against volume of acid added.[4 marks]
  3. 1(b)(iii)On your graph, show the end point of the reaction. Record the corresponding volume below. End point of the reaction = ____ cm³[2 marks]
  4. 1(c)Distinguish between a 'strong acid' and a 'weak acid'.[2 marks]
  5. 1(d)Write a balanced chemical equation for the reaction between NaOH and H₂SO₄.[2 marks]
  6. 1(e)Calculate the number of moles of H₂SO₄ used in the reaction.[2 marks]
  7. 1(f)Calculate the number of moles of NaOH in 25 cm³ of the solution.[2 marks]
  8. 1(g)Calculate the concentration of NaOH, in mol dm⁻³.[2 marks]
  9. 1(h)Calculate the concentration of NaOH, in gdm⁻³, given the molar mass of NaOH = 40 gmol⁻¹.[1 mark]
  10. 1(i)State whether the reaction that took place in the styrofoam cup was exothermic or endothermic. Explain your answer.[2 marks]
  11. 1(j)State ONE safety precaution which should have been taken during the experiment.[1 mark]

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