just saturated if Q = Ksp (saturated)РQ:离子积РWill a precipitate form?РExample 4b-3. 10 cm3 of 0.02 mol · L-1 CaCl2 solution was added with to 10 cm3 of 0.02 mol · L-1Na2C2O4.Р∴CaC2O4will precipitateРExample 4b-4. The carbon dioxide (CO2) was passed through a 1.0 mol · L-1 CaCl2 solution until saturation.Р∴CaCO3 precipitate will not form.Р3. Precipitation-Dissolution equilibriaР3.mon-Ion effect ? The solubility of a slightly soluble pound is lowered in the presence of a second solute that furnishes mon ion.Р3.2 Salt EffectРThe solubility of a slightly soluble pound increases in the presence of a strong electrolyte.Р3.3 Dissolution of a precipitateРThe addition of pound to a slightly soluble solute may cause the reduction of ionic concentration. When Q < Ksp , the precipitation will dissolve.
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