FSU
CHM 1046 -
Precipitation
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16 6 Precipitation Q reaction quotient same equation as K If Q K the solution is unsaturated more solute can dissolve Q K the solution is saturated additional solute won t dissolve Q K the solution is supersaturated PREDICTING PRECIPITATION A precipitate will form if Q K If Q K then no precipitate will form SELECTIVE PRECIPITAION If a solution contains Mg2 and Ca2 and a small amount of NaOH is added Mg OH 2 s and Ca OH 2 s will form When only a small amount of NaOH is added there is only enough OH for one ion to precipitate The one with the smaller Ksp will form a precipitate first Therefore Mg OH 2 has the smaller Ksp value so it will precipitate and Ca OH 2 will not
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