17.5 Common Ion Effect and Precipitation
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Common Ion Effect
The presence of one of the ions a salt dissociates into reduces the solubility of the salt.
What is the molar solubility of AgCl in 0.1M HCl? (Ksp = 1.8×10-10)
What is the molar solubility of Ag2S in 0.0010M AgNO3? (Ksp = 6.0×10-51)
Precipitation
What is the maximum concentration of hydroxide present in a solution with [Mg2+] = 0.010M? (Ksp Mg(OH)2 = 1.6×10-12)
To a solution of 1.0×10-4M Mg(NO3)2, NaOH was added to a final concentration of 2.0×10-4M. Did a precipitate form? (Ksp Mg(OH)2 = 1.6×10-12)
50.0mL of 1.0×10-4M Mg(NO3)2 was mixed with 50.0mL of 2.0×10-4M NaOH. Did a precipitate form? (Ksp Mg(OH)2 = 1.6×10-12)
| Qsp vs Ksp | |
|---|---|
| Qsp < Ksp | Unsaturated |
| Qsp = Ksp | Saturated |
| Qsp > Ksp | A Precipitate Forms |