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CAIE A-Level Chemistry 9.2.5 Period 3 Chloride–Water Reactions

Practise describing hydrolysis of specified Period 3 chlorides and predicting the acidity of the resulting mixtures.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • distinguish NaCl and MgCl2 dissolving behaviour from hydrolysis of covalent chlorides
  • write hydrolysis equations for SiCl4 and PCl5 that produce HCl and the specified oxide or acid
  • predict solution pH from hydrolysis products and use observations to identify an unknown Period 3 chloride

9.2.5—Reactions of the chlorides NaCl, MgCl2, Al question 1

[Maximum number: 2]

The Group 17 elements are oxidising agents.

Table 1.3 gives some information about MgCl2\mathrm{MgCl}_{2} and SiCl4\mathrm{SiCl}_{4}.

Table 1.3

Table 1.3

Suggest the pH of the solutions that form when each chloride is added to water.
MgCl2\mathrm{MgCl}_{2}SiCl4\mathrm{SiCl}_{4}

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