Salt preparations
2 marks · HardState two exceptions to the general solubility of chlorides in water. For each exception, name the insoluble chloride.
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Lead(II) chloride and silver chloride
Also accept: PbCl2 and AgCl; PbCl2, AgCl; lead chloride, silver chloride
Common mistakes: Naming lead(II) sulfate or silver sulfate instead of chlorides
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Marking points
B1 · 1 mark · Lead(II) chloride identified as insoluble in water.
B2 · 1 mark · Silver chloride identified as insoluble in water.
Worked solution
Most common chlorides are soluble, but lead(II) chloride (PbCl2) and silver chloride (AgCl) are exceptions and insoluble in water.