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7 marksPeriod 3: Sodium to Argon

CAPE Chemistry Unit 1 · 2014 · Paper 2 · Question 6(b)(ii)

The pH of an aqueous solution of sodium chloride is 7, while the corresponding value for aluminium chloride is 3.

Explain the following observation. (Include relevant equations to support your answer.)

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Other parts of this question

  1. 6(a)Define the term 'polarization'.[2 marks]
  2. 6(b)(i)State the trend in ionic size of the elements from Na to Al.[1 mark]
  3. 6(c)(i)State the name of the halide ion in A.[1 mark]
  4. 6(c)(ii)Write the formula equation for the reaction of A with chlorine.[2 marks]
  5. 6(c)(iii)Describe an additional simple test to confirm the identity of the halide ion in A.[2 marks]

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