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2 marksMole Concept

CSEC Chemistry · January 2018 · Paper 2 · Question 1(a)(iii)

Deneil is provided with two solutions, M (aqueous hydrochloric acid, 3.6 g dm⁻³) and N (aqueous sodium hydroxide). She titrates solution M against 25.0 cm³ of solution N to determine the concentration of sodium hydroxide. Figure 1 shows the burette volume readings (initial and final) for three titrations.

Calculate the concentration of hydrochloric acid in solution M, in mol dm⁻³. (Relative atomic mass: H = 1; Cl = 35.5)

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Other parts of this question

  1. 1(a)(i)Complete Table 1 by recording the titration results obtained from the experiment in Figure 1.[9 marks]
  2. 1(a)(ii)Calculate the average volume of solution M used in the titration.[1 mark]
  3. 1(a)(iv)Calculate the number of moles of hydrochloric acid used in the titration.[1 mark]
  4. 1(a)(v)Write a balanced equation for the reaction between the hydrochloric acid and sodium hydroxide solutions.[1 mark]
  5. 1(a)(vi)Determine the number of moles of sodium hydroxide in the 25 cm³ of solution used.[2 marks]
  6. 1(a)(vii)Calculate the concentration of sodium hydroxide, in g dm⁻³. (Molar mass of sodium hydroxide = 40 g mol⁻¹)[2 marks]
  7. 1(b)(i)Identify the forces that exist in a ‘molecular solid'.[1 mark]
  8. 1(b)(ii)Sodium chloride, another solid, has a higher melting and boiling point than stearic acid. Explain why this is so.[2 marks]
  9. 1(b)(iii)Using the axes provided in Figure 2 on page 9, plot a graph of temperature against time from the information in Table 2. One point has already been plotted.…[4 marks]

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