Quelpr
2 marksMole Concept

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

From the data in Table 1, calculate EACH of the following:

Mass of sodium hydroxide dissolved in 250 cm³ of water (Relative atomic mass: Na = 23, O = 16, H = 1)

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)Use the information given in Figure 1 above to complete Table 1 below.[4 marks]
  2. 1(a)(ii)Write a chemical equation for the reaction that occurs during the titration.[1 mark]
  3. 1(a)(iii)The number of moles of hydrochloric acid used in the titration[1 mark]
  4. 1(a)(iv)The number of moles of sodium hydroxide in 25.0 cm³ of the solution[1 mark]
  5. 1(a)(v)The number of moles of sodium hydroxide in 250 cm³ of solution[1 mark]
  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]

More practice: the rest of this paper · more Mole Concept questions · all CSEC Chemistry past papers