Prepare an Insoluble Salt (Edexcel IGCSE Chemistry)
Revision Note
Author
StewartExpertise
Chemistry Lead
Prepare an Insoluble Salt
- Insoluble salts can be prepared using a precipitation reaction
- The solid salt obtained is the precipitate, thus in order to successfully use this method the solid salt being formed must be insoluble in water
- The preparation of a soluble salt follows this pattern:
soluble salt 1 + soluble salt 2 ⟶ insoluble salt + soluble salt 3
AB + CD ⟶ AD + CB
- The method involves measuring out a fixed volume of one solution and then adding the second salt solution until it is in a slight excess
- This ensures the maximum amount of precipitate will be obtained
- The precipitate is recovered by filtration and then it must be washed with distilled water remove reactants that are contaminating the residue (recovered solid)
- It is then left to dry
- This method is a good way to prepare silver and lead(II) salts which are often insoluble; the starting material will usually be the nitrate of silver or lead(II) since all nitrates are soluble
Exam Tip
This reaction is also known as a double decomposition reaction.
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