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4 marksMole Concept

CSEC Chemistry · May/June 2007 · Paper 2 · Question 1(a)(i)

A student prepares a sodium hydroxide solution and titrates 25.0 cm³ of it against a 0.050 mol dm⁻³ hydrochloric acid solution. Figure 1 shows burette readings for three titrations.

Use the information given in Figure 1 above to complete Table 1 below.

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Other parts of this question

  1. 1(a)(ii)Write a chemical equation for the reaction that occurs during the titration.[1 mark]
  2. 1(a)(iii)The number of moles of hydrochloric acid used in the titration[1 mark]
  3. 1(a)(iv)The number of moles of sodium hydroxide in 25.0 cm³ of the solution[1 mark]
  4. 1(a)(v)The number of moles of sodium hydroxide in 250 cm³ of solution[1 mark]
  5. 1(a)(vi)Mass of sodium hydroxide dissolved in 250 cm³ of water (Relative atomic mass: Na = 23, O = 16, H = 1)[2 marks]
  6. 1(b)A student carries out the following tests on a solid, Q, and makes the observations recorded in Table 2 below. Complete Table 2 to show all possible inferences…[7 marks]
  7. 1(b)(v)Suggest the possible identity of Q.[1 mark]
  8. 1(c)(i)A suggested list of apparatus which you would use in recovering the solid sea salt from the sandy sea water[4 marks]
  9. 1(c)(ii)An outline of the steps for the procedure you could use[4 marks]
  10. 1(c)(iii)List the main observations that would be expected at each stage of the experiment.[2 marks]
  11. 1(c)(iv)A student suggests that solid sea salt contains chloride ions. How would you go about testing for chloride ions in the solid sea salt?[2 marks]

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