Solubility of Salts
Which is Which?
Use the table below to help you identify which salts are soluble and which are not.
|All Sodium, Potassium and ammonium|
|Chlorides||Except silver and lead, chlorides|
|Sulphate||Except calcium, barium and lead sulphates|
|Sodium, potassium and ammonium carbonates|
|All other carbonates and hydroxides are insoluble|
Preparation of Soluble Salts
To prepare soluble salts you must form crystals of them.
Preparing Insoluble Salts
A precipitate is the name given to a solid salt that forms when an insoluble salt is produced from a reaction. For example, with barium chloride and magnesium sulphate...
Barium Chloride + Magnesium Sulphate Barium Sulphate + Magnesium Chloride
BaCl2 + MgSO4 BaSO4 + MgCl2
You will see a white precipitate of barium sulphate ...
To get a pure, dry sample of Barium Sulphate it must be...
washed with distilled water,
and then left to allow the excess water to evaporate.