Salts are composed of positive and negative ions and are solid at room temperature. They can be classified based on their ability to dissolve in water, with soluble salts dissolving well and insoluble salts dissolving poorly or not at all.
Solubility (s) is the maximum amount of salt that can dissolve in a given volume of water at a specific temperature, usually expressed in grams per cubic decimeter (g/dm³). For example, a solubility of 220 g/dm³ for silver nitrate at 25 ºC means that up to 220 grams can dissolve in 1 dm³ of water at that temperature.
Soluble salts dissolve well in water, such as sodium hydroxide (750 g/dm³) and nitrates like silver nitrate (220 g/dm³). Insoluble salts dissolve poorly or not at all, such as calcium carbonate (0.0093 g/dm³).
Classification of salts based on solubility at 25 ºC involves categorizing salts as soluble or insoluble depending on their solubility values, which are often obtained from tables. For instance, calcium carbonate is considered practically insoluble due to its very low solubility.
1. What does 'Sal Solubility' refer to?
2. Which salt's solubility decreases as temperature increases, contrary to the general trend?
3. What is the primary natural role of precipitation reactions involving calcium carbonate in caves?
Salts — composition?
Formed from positive and negative ions.
Solubility — definition?
Max salt amount dissolvable in water at a specific T.
Soluble salts — example?
Sodium hydroxide, nitrates like silver nitrate.
Insoluble salts — example?
Calcium carbonate, barium sulfate.
Solubility at 25 ºC — trend?
Varies; generally increases with temperature.
Precipitation reaction — process?
Formation of insoluble salt from soluble reactants.
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