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2 marksSolubility Product

CAPE Chemistry Unit 1 · May/June 2025 · Paper 2 · Question 2(c)

A saturated solution of silver chloride is filtered and the residue washed with dilute hydrochloric acid instead of water.

Comment on the solubility of silver chloride in water compared with the solubility of silver chloride in dilute hydrochloric acid and justify the difference, if any.

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  1. 2(a)(i)Describe the FOUR characteristic features of this dynamic equilibrium.[4 marks]
  2. 2(a)(ii)Write a balanced chemical equation to represent the reaction described in 2(a) above.[2 marks]
  3. 2(a)(iii)Calculate the Kp value of the equilibrium mixture.[3 marks]
  4. 2(b)(i)Describe EACH of the following terms: Solubility product [2 marks] Common ion effect [2 marks][4 marks]
  5. 2(b)(ii)Calcium phosphate, Ca3(PO4)2, is a water-insoluble mineral used to make commercial fertilizers. Given that the concentrations of Ca2+ and PO4^3- ions in…[3 marks]
  6. 2(b)(iii)Write a balanced equation for the equilibrium reaction of the formation of calcium and phosphate ions from calcium phosphate.[2 marks]
  7. 2(d)Write the steps in an experimental procedure for the determination of the solubility product constant of barium hydroxide, Ba(OH)2.[5 marks]
  8. 2(e)(i)Define the term 'buffer solution'.[1 mark]
  9. 2(e)(ii)Explain how the molecular structure of amino acids relates to their function as buffer solutions in human blood.[3 marks]
  10. 2(e)(iii)State ONE industry in which buffer solutions are used.[1 mark]

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