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2 marksAcids, Bases and Salts

CSEC Chemistry · January 2010 · Paper 2 · Question 1(a)(i)

Copper(II) oxide reacts with dilute sulphuric acid to produce either anhydrous or hydrated salts. The type of salt depends on the procedure. Table 1 shows 5 experiments with different masses of anhydrous copper(II) salt formed by reacting varying masses of copper(II) oxide with 50 cm³ of 1 mol dm⁻³ sulphuric acid. A reading for Experiment 3 is missing from Table 1.

Explain how a salt is formed.

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Other parts of this question

  1. 1(a)(ii)What is the difference between 'anhydrous salts' and 'hydrated salts'?[2 marks]
  2. 1(a)(iii)Write a balanced chemical equation to show the production of the anhydrous salt from the reaction between copper(II) oxide and dilute sulphuric acid.[2 marks]
  3. 1(a)(iv)Given that the relative formula mass of copper(II) oxide is 80, complete the data in Table 1 by calculating the mass of the salt formed in Experiment 3.…[4 marks]
  4. 1(a)(v)Using the data from Table 1 and the axes provided on page 4, plot a graph of the mass of anhydrous salt produced against the mass of copper(II) oxide used.[3 marks]
  5. 1(a)(vi)Using the graph plotted in (v) above, determine the mass of salt that would be formed from 2.95 g of copper(II) oxide.[1 mark]
  6. 1(a)(vii)Explain why there is no change in the mass of salt produced for Experiments 4 and 5.[1 mark]
  7. 1(b)Complete Table 2 to show the remaining observations and inferences made by the student.[5 marks]
  8. 1(c)Describe an appropriate method to produce a pure solid sample of silver chloride starting with silver nitrate solution. (Hint! All silver salts are decomposed…[3 marks]

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