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.
Precipitate — definition?
Poorly soluble solid formed during reactions.
Chemical equation — example?
Pb(NO₃)₂ + 2 KI → PbI₂ (s) + 2 NaNO₃.
Solubility and temperature — effect?
Most salts dissolve more as temperature rises.
Exceptions — salts?
Calcium carbonate decreases solubility with higher T.
Natural precipitation — example?
Stalactites formed from calcium carbonate deposits.
Dissolution of calcium carbonate — role?
Releases calcium bicarbonate into water.
Recrystallization — process?
Precipitation of calcium carbonate from calcium bicarbonate.
Environmental impact — example?
Acid rain dissolves limestone, forming caves.
Formation of stalactites — mechanism?
Precipitation of calcium carbonate from dripping water.
Dissolution — reaction?
Calcium carbonate + acid → calcium bicarbonate.
Recrystallization — reaction?
Calcium bicarbonate → calcium carbonate + CO₂.
Effect of temperature on solubility — general?
Usually increases, but some salts like calcium carbonate decrease.
Тествайте знанията си с 9 въпроса по Understanding Salt Solubility and Precipitation.
1. What does 'Sal Solubility' refer to?
2. Which salt's solubility decreases as temperature increases, contrary to the general trend?
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