Solubility rules

Solubility - (scaffolding text)

Some substances, such as common table salt (sodium chloride) will dissolve easily in water.
Substances, like sodium chloride (NaCl), that dissolve in water are soluble.
Substances, like chalk powder (calcium carbonate), don't dissolve in water, and are insoluble.
The solid that dissolves in the water is called the solute.
The liquid that 'does the dissolving' is called the solvent.
Solute + solvent = solution
sodium chloride + water = sodium chloride solution

The solubility rules are set of rules that can be used to find out whether a substance is soluble in water.
If the substance is soluble in water it will form an aqueous solution.
If the substance is insoluble in water then it will be a solid and form a precipitate.

The solubility rules used for NCEA Level 2 Chemistry are:

All Group 1 compounds are soluble
All ammonium compounds are soluble
All nitrate compounds are soluble
Most sulfates are soluble except for calcium sulfate, barium sulfate and lead sulfate
Most halides are soluble except for those salts with silver and lead
All carbonates are insoluble except those of Group 1 and ammonium ion
All oxides, hydroxides are insoluble except those of Group 1 and ammonium ion
All sulfides are insoluble except those of Group 1 and ammonium ion.

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